[JDK20] Enable StructuredTaskScopeTest (#4546)

Related: eclipse-openj9/openj9#15627
Related: eclipse-openj9/openj9#15629

Signed-off-by: Babneet Singh <[email protected]>

Author: babsingh

openjdk/excludes/ProblemList_openjdk20-openj9.txt

@@ -458,7 +458,6 @@ jdk/dynalink/TypeConverterFactoryRetentionTests.java#with_ParallelGC https://git
 jdk/dynalink/TypeConverterFactoryRetentionTests.java#with_SerialGC https://github.com/adoptium/aqa-tests/issues/1297 generic-all
 jdk/dynalink/TypeConverterFactoryRetentionTests.java#with_ShenandoahGC https://github.com/adoptium/aqa-tests/issues/1297 generic-all
 jdk/dynalink/TypeConverterFactoryRetentionTests.java#with_ZGC https://github.com/adoptium/aqa-tests/issues/1297 generic-all
-jdk/incubator/concurrent/StructuredTaskScope/StructuredTaskScopeTest.java https://github.com/eclipse-openj9/openj9/issues/15624 generic-all
 jdk/incubator/concurrent/StructuredTaskScope/StructuredThreadDumpTest.java https://github.com/eclipse-openj9/openj9/issues/15278 generic-all
 jdk/internal/misc/VM/GetNanoTimeAdjustment.java https://github.com/eclipse-openj9/openj9/issues/7184 generic-all
 jdk/internal/misc/VM/RuntimeArguments.java https://github.com/eclipse-openj9/openj9/issues/7186 generic-all