Convert some of the p2 test suites to JUnit 5

[akurtakov]

No description provided.

[github-actions]

Test Results

   18 files  ± 0     18 suites  ±0   27m 0s ⏱️ -9s
1 940 tests +35  1 937 ✅ +35  3 💤 ±0  0 ❌ ±0 
5 164 runs  ± 0  5 155 ✅ ± 0  9 💤 ±0  0 ❌ ±0 

Results for commit 07d1e61. ± Comparison against base commit 5377447.

This pull request removes 738 and adds 773 tests. Note that renamed tests count towards both.

org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAddChild
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAddChildToExistingArtifactRepository
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAddChildToExistingMetadataRepository
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAddChildToExistingRepositories
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAddChildToNewArtifactRepository
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAddChildToNewMetadataRepository
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAtomicArtifactRepository
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testAtomicMetadataRepository
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testBaselineCompareUsingComparator
org.eclipse.equinox.p2.tests.ant.AllTests ‑ testCreateCombinedCompositeRepository
…

org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAddChild
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAddChildToExistingArtifactRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAddChildToExistingMetadataRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAddChildToExistingRepositories
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAddChildToNewArtifactRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAddChildToNewMetadataRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAtomicArtifactRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testAtomicMetadataRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testCreateCombinedCompositeRepository
org.eclipse.equinox.p2.tests.ant.CompositeRepositoryTaskTest ‑ testCreateCompositeArtifactRepository
…