Remove "deduplicated" spannable path

Summary:
This removes the bulk of code added in facebook#39630.

We're not shipping it, as it caused performance regressions. After this, I'm going to see if I can delete the non-MapBuffer version of TextLayoutManager, which is probably

Differential Revision: D56796936

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -7088,7 +7088,7 @@ public class com/facebook/react/views/text/FontMetricsUtil {
 	public static fun getFontMetrics (Ljava/lang/CharSequence;Landroid/text/Layout;Landroid/text/TextPaint;Landroid/content/Context;)Lcom/facebook/react/bridge/WritableArray;
 }
 
-public abstract class com/facebook/react/views/text/ReactBaseTextShadowNode : com/facebook/react/uimanager/LayoutShadowNode, com/facebook/react/views/text/BasicTextAttributeProvider {
+public abstract class com/facebook/react/views/text/ReactBaseTextShadowNode : com/facebook/react/uimanager/LayoutShadowNode {
 	public static final field DEFAULT_TEXT_SHADOW_COLOR I
 	public static final field PROP_SHADOW_COLOR Ljava/lang/String;
 	public static final field PROP_SHADOW_OFFSET Ljava/lang/String;
@@ -7126,22 +7126,6 @@ public abstract class com/facebook/react/views/text/ReactBaseTextShadowNode : co
 	protected field mTextShadowRadius F
 	public fun <init> ()V
 	public fun <init> (Lcom/facebook/react/views/text/ReactTextViewManagerCallback;)V
-	public fun getAccessibilityRole ()Lcom/facebook/react/uimanager/ReactAccessibilityDelegate$AccessibilityRole;
-	public fun getBackgroundColor ()I
-	public fun getColor ()I
-	public fun getFontFamily ()Ljava/lang/String;
-	public fun getFontFeatureSettings ()Ljava/lang/String;
-	public fun getFontStyle ()I
-	public fun getFontWeight ()I
-	public fun getRole ()Lcom/facebook/react/uimanager/ReactAccessibilityDelegate$Role;
-	public fun getTextShadowColor ()I
-	public fun getTextShadowOffsetDx ()F
-	public fun getTextShadowOffsetDy ()F
-	public fun getTextShadowRadius ()F
-	public fun isBackgroundColorSet ()Z
-	public fun isColorSet ()Z
-	public fun isLineThroughTextDecorationSet ()Z
-	public fun isUnderlineTextDecorationSet ()Z
 	public fun setAccessibilityRole (Ljava/lang/String;)V
 	public fun setAdjustFontSizeToFit (Z)V
 	public fun setAllowFontScaling (Z)V
@@ -7382,7 +7366,7 @@ public class com/facebook/react/views/text/ReactVirtualTextViewManager$$PropsSet
 	public fun setProperty (Lcom/facebook/react/views/text/ReactVirtualTextViewManager;Landroid/view/View;Ljava/lang/String;Ljava/lang/Object;)V
 }
 
-public class com/facebook/react/views/text/TextAttributeProps : com/facebook/react/views/text/EffectiveTextAttributeProvider {
+public class com/facebook/react/views/text/TextAttributeProps {
 	public static final field TA_KEY_ACCESSIBILITY_ROLE S
 	public static final field TA_KEY_ALIGNMENT S
 	public static final field TA_KEY_ALLOW_FONT_SCALING S

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlags.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<71bd0e6d2f2bd2c768b86a073451430c>>
+ * @generated SignedSource<<ed2d49ccaaa01c0f34e37ff43b53d1d8>>
  */
 
 /**
@@ -76,12 +76,6 @@ public object ReactNativeFeatureFlags {
   @JvmStatic
   public fun enableMicrotasks(): Boolean = accessor.enableMicrotasks()
 
-  /**
-   * Uses new, deduplicated logic for constructing Android Spannables from text fragments
-   */
-  @JvmStatic
-  public fun enableSpannableBuildingUnification(): Boolean = accessor.enableSpannableBuildingUnification()
-
   /**
    * Dispatches state updates synchronously in Fabric (e.g.: updates the scroll position in the shadow tree synchronously from the main thread).
    */

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxAccessor.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<d03e37b3d80929ca78d8a6eecd9852a9>>
+ * @generated SignedSource<<50c8aeff2f02f26b75bcf62f448ca60d>>
  */
 
 /**
@@ -28,7 +28,6 @@ public class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAccesso
   private var enableBackgroundExecutorCache: Boolean? = null
   private var enableCleanTextInputYogaNodeCache: Boolean? = null
   private var enableMicrotasksCache: Boolean? = null
-  private var enableSpannableBuildingUnificationCache: Boolean? = null
   private var enableSynchronousStateUpdatesCache: Boolean? = null
   private var enableUIConsistencyCache: Boolean? = null
   private var fixMountedFlagAndFixPreallocationCloneCache: Boolean? = null
@@ -112,15 +111,6 @@ public class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAccesso
     return cached
   }
 
-  override fun enableSpannableBuildingUnification(): Boolean {
-    var cached = enableSpannableBuildingUnificationCache
-    if (cached == null) {
-      cached = ReactNativeFeatureFlagsCxxInterop.enableSpannableBuildingUnification()
-      enableSpannableBuildingUnificationCache = cached
-    }
-    return cached
-  }
-
   override fun enableSynchronousStateUpdates(): Boolean {
     var cached = enableSynchronousStateUpdatesCache
     if (cached == null) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxInterop.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<5d418feb35bbe1bc78c9b2887acf0e3d>>
+ * @generated SignedSource<<dbc8923e390428cf599ca1bb38d3c7ed>>
  */
 
 /**
@@ -44,8 +44,6 @@ public object ReactNativeFeatureFlagsCxxInterop {
 
   @DoNotStrip @JvmStatic public external fun enableMicrotasks(): Boolean
 
-  @DoNotStrip @JvmStatic public external fun enableSpannableBuildingUnification(): Boolean
-
   @DoNotStrip @JvmStatic public external fun enableSynchronousStateUpdates(): Boolean
 
   @DoNotStrip @JvmStatic public external fun enableUIConsistency(): Boolean

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<eae8be3ca2fef75be0f254a6711fe40c>>
+ * @generated SignedSource<<a0cd02254838c990161b7b350c65402a>>
  */
 
 /**
@@ -39,8 +39,6 @@ public open class ReactNativeFeatureFlagsDefaults : ReactNativeFeatureFlagsProvi
 
   override fun enableMicrotasks(): Boolean = false
 
-  override fun enableSpannableBuildingUnification(): Boolean = false
-
   override fun enableSynchronousStateUpdates(): Boolean = false
 
   override fun enableUIConsistency(): Boolean = false

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsLocalAccessor.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<5f08267961d732e2f573ed933abf5ab9>>
+ * @generated SignedSource<<88e9d6c51edd3e6fca3c01b9a8968bba>>
  */
 
 /**
@@ -32,7 +32,6 @@ public class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcces
   private var enableBackgroundExecutorCache: Boolean? = null
   private var enableCleanTextInputYogaNodeCache: Boolean? = null
   private var enableMicrotasksCache: Boolean? = null
-  private var enableSpannableBuildingUnificationCache: Boolean? = null
   private var enableSynchronousStateUpdatesCache: Boolean? = null
   private var enableUIConsistencyCache: Boolean? = null
   private var fixMountedFlagAndFixPreallocationCloneCache: Boolean? = null
@@ -124,16 +123,6 @@ public class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcces
     return cached
   }
 
-  override fun enableSpannableBuildingUnification(): Boolean {
-    var cached = enableSpannableBuildingUnificationCache
-    if (cached == null) {
-      cached = currentProvider.enableSpannableBuildingUnification()
-      accessedFeatureFlags.add("enableSpannableBuildingUnification")
-      enableSpannableBuildingUnificationCache = cached
-    }
-    return cached
-  }
-
   override fun enableSynchronousStateUpdates(): Boolean {
     var cached = enableSynchronousStateUpdatesCache
     if (cached == null) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsProvider.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<0aac08cb953e08d090fedebf12a9e99c>>
+ * @generated SignedSource<<08acc01776848d8f2b55d68dcc71fdec>>
  */
 
 /**
@@ -39,8 +39,6 @@ public interface ReactNativeFeatureFlagsProvider {
 
   @DoNotStrip public fun enableMicrotasks(): Boolean
 
-  @DoNotStrip public fun enableSpannableBuildingUnification(): Boolean
-
   @DoNotStrip public fun enableSynchronousStateUpdates(): Boolean
 
   @DoNotStrip public fun enableUIConsistency(): Boolean