[TEMP] Move pde.ui.tests to Java-21 to investigate I-build test failures

[HannesWell]

Currently there are nine test failures in org.eclipse.pde.ui.tests on Linux with Java-21 and 23:

• https://download.eclipse.org/eclipse/downloads/drops4/I20241109-1800/testresults/html/org.eclipse.pde.ui.tests_ep434I-unit-linux-x86_64-java21_linux.gtk.x86_64_21.html
• https://download.eclipse.org/eclipse/downloads/drops4/I20241109-1800/testresults/html/org.eclipse.pde.ui.tests_ep434I-unit-linux-x86_64-java23_linux.gtk.x86_64_23.html

This is an attempt to reproduce their failure in verification builds.

[github-actions]

Test Results

 54 files   -    231   54 suites   - 231   8m 45s ⏱️ - 40m 10s
290 tests  -  3 296  262 ✅  - 3 248  28 💤  -  48  0 ❌ ±0 
936 runs   - 10 014  849 ✅  - 9 870  87 💤  - 144  0 ❌ ±0 

Results for commit e56037a. ± Comparison against base commit 5cac9e2.

This pull request removes 3296 tests.

AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_importPackage
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_includeFragments
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_includeFragmentsProvidingPackages
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_includeNonTestFragments
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_includeOptional
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_requireBundle
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_requireBundle2
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_requireDifferentVersions
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.DependencyManagerTest ‑ testFindRequirementsClosure_requiredCapability
AllPDETests org.eclipse.pde.core.tests.internal.AllPDECoreTests org.eclipse.pde.core.tests.internal.WorkspaceModelManagerTest ‑ testBundleRootHandling_bundleRootChangedFromDefaultToOthersAndReverse
…

[HannesWell]

In https://download.eclipse.org/eclipse/downloads/drops4/I20241109-1800/testresults/ep434I-unit-linux-x86_64-java21_linux.gtk.x86_64_21/org.eclipse.pde.ui.tests.AllPDETests.txt I see messages like the following and wonder if the Java indexing might have issues with JDKs above 17 (at least the ones installed on the I-build machines):

!ENTRY org.eclipse.pde.ui.tests 4 0 2024-11-10 00:41:47.557
!MESSAGE [testImportLinksMultiple[Import with source]] Some job is still running or waiting to run: 
'Java indexing... 37 files to index (/usr/lib/jvm/java-17-openjdk-amd64/lib/jrt-fs.jar)(828)'/org.eclipse.jdt.internal.core.search.processing.JobManager$1ProgressJob
thread info: "Worker-3: Java indexing... " prio=5 Id=48 TIMED_WAITING on org.eclipse.jdt.internal.core.search.indexing.IndexManager@7f14dc05
	at [email protected]/java.lang.Object.wait0(Native Method)
	-  waiting on org.eclipse.jdt.internal.core.search.indexing.IndexManager@7f14dc05
	at [email protected]/java.lang.Object.wait(Object.java:366)
	at org.eclipse.jdt.internal.core.search.processing.JobManager$1ProgressJob.run(JobManager.java:471)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

, 
'Building(6)'/org.eclipse.core.internal.events.AutoBuildJob
thread info: "Worker-7: Building" prio=5 Id=52 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@43c1e01d
	at [email protected]/jdk.internal.misc.Unsafe.park(Native Method)
	-  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@43c1e01d
	at [email protected]/java.util.concurrent.locks.LockSupport.park(LockSupport.java:371)
	at [email protected]/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:519)
	at [email protected]/java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3780)
	at [email protected]/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3725)
	at [email protected]/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1707)
	at [email protected]/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420)
	at org.eclipse.jdt.internal.compiler.ProcessTaskManager.removeNextUnits(ProcessTaskManager.java:81)
	...



!ENTRY org.eclipse.pde.ui.tests 1 0 2024-11-10 00:41:47.558
!MESSAGE [testImportLinksMultiple[Import with source]] Trying to cancel running jobs: [Java indexing... 37 files to index (/usr/lib/jvm/java-17-openjdk-amd64/lib/jrt-fs.jar)(828), Building(6), Animation start(37)]

!ENTRY org.eclipse.pde.ui.tests 4 0 2024-11-10 00:41:47.786
!MESSAGE [testImportLinksMultiple[Import with source]] Some job is still running or waiting to run: 
'Java indexing... 37 files to index (/usr/lib/jvm/java-17-openjdk-amd64/lib/jrt-fs.jar)(828)'/org.eclipse.jdt.internal.core.search.processing.JobManager$1ProgressJob
thread info: "Worker-3: Java indexing... " prio=5 Id=48 TIMED_WAITING on org.eclipse.jdt.internal.core.search.indexing.IndexManager@7f14dc05
	at [email protected]/java.lang.Object.wait0(Native Method)
	-  waiting on org.eclipse.jdt.internal.core.search.indexing.IndexManager@7f14dc05
	at [email protected]/java.lang.Object.wait(Object.java:366)
	at org.eclipse.jdt.internal.core.search.processing.JobManager$1ProgressJob.run(JobManager.java:471)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

, 
'Building(6)'/org.eclipse.core.internal.events.AutoBuildJob
thread info: "Worker-7: Building" prio=5 Id=52 RUNNABLE
	at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:552)
	at org.eclipse.core.internal.events.ResourceDeltaFactory.createDelta(ResourceDeltaFactory.java:140)
	at org.eclipse.core.internal.events.ResourceDeltaFactory.createDelta(ResourceDeltaFactory.java:161)
	at org.eclipse.core.internal.events.ResourceDeltaFactory.createDelta(ResourceDeltaFactory.java:161)
	at org.eclipse.core.internal.events.ResourceDeltaFactory.createDelta(ResourceDeltaFactory.java:161)
	at org.eclipse.core.internal.events.ResourceDeltaFactory.createDelta(ResourceDeltaFactory.java:161)
	at org.eclipse.core.internal.events.ResourceDeltaFactory.computeDelta(ResourceDeltaFactory.java:67)
	at org.eclipse.core.internal.events.NotificationManager.getDelta(NotificationManager.java:256)
	...

But this might be a false hint, since https://download.eclipse.org/eclipse/downloads/drops4/I20241109-1800/testresults/ep434I-unit-linux-x86_64-java23_linux.gtk.x86_64_23/org.eclipse.pde.ui.tests.AllPDETests.txt
only shows the Some job is still running or waiting to run only on other cases, just like the test in other configurations do it too.