COMP: Fix for gcc13.2 compiler test failures

Three tests fail in ITK for Release and RelWithDebInfo builds on Ubuntu 24.04 with GCC 13.2:
itkGDCMLegacyMultiFrameTest (Failed)
itkGDCMImageReadWriteTest_MultiFrameMRIZSpacing (Failed)
itkGDCM_ComplianceTest_singlebit (Failed)

(Note: Debug builds do not fail these tests)

The initial review of the code did not indicate a problem, but it looks like perhaps an over-optimization that removes variables and causes the incorrect behavior to occur.

The function "FindDataElement" had duplicate code from "GetDataElement" so made "FindDataElement" use the "GetDataElement" working function.

Modules/ThirdParty/GDCM/src/gdcm/Source/DataStructureAndEncodingDefinition/gdcmDataSet.h

@@ -209,13 +209,9 @@ class GDCM_EXPORT DataSet
 
   // DUMB: this only search within the level of the current DataSet
   bool FindDataElement(const Tag &t) const {
-    const DataElement r(t);
-    //ConstIterator it = DES.find(r);
-    if( DES.find(r) != DES.end() )
-      {
-      return true;
-      }
-    return false;
+    const auto it = GetDataElement(t);
+    // Return if tag is found
+    return it != GetDEEnd();
     }
 
   // WARNING: