Add generic interface to federation tests

Adding generic sealed interface to tests and removing restrictive checks

apollo-execution-processor/src/main/kotlin/com/apollographql/execution/processor/definitions.kt

@@ -111,12 +111,6 @@ private class TypeDefinitionContext(
       }
       usedNames.add(name)
 
-      if (declaration.typeParameters.isNotEmpty()) {
-        logger.error("Generic classes are not supported")
-        typeDefinitions.put(qualifiedName, null)
-        continue
-      }
-
       if (unsupportedTypes.contains(qualifiedName)) {
         logger.error(
           "'$qualifiedName' is not a supported built-in type. Either use one of the built-in types (Boolean, String, Int, Double) or use a custom scalar.",
@@ -353,6 +347,7 @@ private class TypeDefinitionContext(
           GQLEnumValue(null, simpleName.asString())
         }
       }
+
       else -> {
         logger.error("Cannot convert $this to a GQLValue", argument)
         GQLNullValue(null) // not correct but compilation should fail anyway
@@ -477,10 +472,7 @@ private class TypeDefinitionContext(
   private fun KSClassDeclaration.interfaces(): List<String> {
     return getAllSuperTypes().mapNotNull {
       val declaration = it.declaration
-      if (it.arguments.isNotEmpty()) {
-        logger.error("Generic interfaces are not supported", this)
-        null
-      } else if (declaration is KSClassDeclaration) {
+      if (declaration is KSClassDeclaration) {
         if (declaration.asClassName().asString() == "kotlin.Any") {
           null
         } else if (declaration.containingFile == null) {

tests/federation/src/main/kotlin/graphql.kt

@@ -1,8 +1,10 @@
 import com.apollographql.execution.annotation.GraphQLQuery
 import com.apollographql.execution.subgraph.GraphQLKey
 
+sealed interface SomeGenericInterface<T>
+
 @GraphQLQuery
-class Query {
+class Query: SomeGenericInterface<String>{
   fun products(): List<Product> {
     return products
   }