Migrate compare performance tests to JUnit 5

[HeikoKlare]

The performance test in org.eclipse.compare.tests still relies on the JUnit 3 PerformanceTestCase. This change migrates the compare performance test and test suite to JUnit 5.

Note that the performance tests are not executed in CI builds, so the change will probably not have any effect that is automatically validated.

[github-actions]

Test Results

       90 files  +     54         90 suites  +54   55m 11s ⏱️ + 6m 36s
  3 778 tests +1 035    3 775 ✔️ +1 036    3 💤 ±0  0 ❌  - 1 
11 337 runs  +3 105  11 310 ✔️ +3 106  27 💤 ±0  0 ❌  - 1 

Results for commit 2466dc2. ± Comparison against base commit cfb3c5f.

This pull request removes 126 and adds 1161 tests. Note that renamed tests count towards both.

org.eclipse.compare.tests.AsyncExecTests ‑ testCancelOnRequeue
org.eclipse.compare.tests.AsyncExecTests ‑ testQueueAdd
org.eclipse.compare.tests.AsyncExecTests ‑ testWorker
org.eclipse.compare.tests.CompareFileRevisionEditorInputTest ‑ testPrepareCompareInputWithNonLocalResourceTypedElements
org.eclipse.compare.tests.CompareUIPluginTest ‑ testFindContentViewerDescriptorForTextType_StreamAccessor
org.eclipse.compare.tests.CompareUIPluginTest ‑ testFindContentViewerDescriptor_TextType_NotStreamAccessor
org.eclipse.compare.tests.CompareUIPluginTest ‑ testFindContentViewerDescriptor_UnknownType
org.eclipse.compare.tests.ContentMergeViewerTest ‑ testFFFX
org.eclipse.compare.tests.ContentMergeViewerTest ‑ testFFTX
org.eclipse.compare.tests.ContentMergeViewerTest ‑ testFFXF
…

AllCompareTests org.eclipse.compare.tests.AsyncExecTests ‑ testCancelOnRequeue
AllCompareTests org.eclipse.compare.tests.AsyncExecTests ‑ testQueueAdd
AllCompareTests org.eclipse.compare.tests.AsyncExecTests ‑ testWorker
AllCompareTests org.eclipse.compare.tests.CompareFileRevisionEditorInputTest ‑ testPrepareCompareInputWithNonLocalResourceTypedElements
AllCompareTests org.eclipse.compare.tests.CompareUIPluginTest ‑ testFindContentViewerDescriptorForTextType_StreamAccessor
AllCompareTests org.eclipse.compare.tests.CompareUIPluginTest ‑ testFindContentViewerDescriptor_TextType_NotStreamAccessor
AllCompareTests org.eclipse.compare.tests.CompareUIPluginTest ‑ testFindContentViewerDescriptor_UnknownType
AllCompareTests org.eclipse.compare.tests.ContentMergeViewerTest ‑ testFFFX
AllCompareTests org.eclipse.compare.tests.ContentMergeViewerTest ‑ testFFTX
AllCompareTests org.eclipse.compare.tests.ContentMergeViewerTest ‑ testFFXF
…

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