Migrate org.eclipse.text.tests from JUnit4 to JUnit5

[vogella]

• Convert @RunWith(Suite.class) to @suite
• Convert @Suite.SuiteClasses to @SelectClasses
• Update imports from org.junit.runners to org.junit.platform.suite.api
• Add org.junit.jupiter.api and org.junit.platform.suite.api to Import-Package

[github-actions]

Test Results

 3 012 files  +12   3 012 suites  +12   2h 19m 32s ⏱️ - 17m 19s
 8 215 tests ± 0   7 966 ✅ ± 0  249 💤 ±0  0 ❌ ±0 
23 565 runs  ± 0  22 771 ✅ ± 0  794 💤 ±0  0 ❌ ±0 

Results for commit 234298b. ± Comparison against base commit 873d899.

This pull request removes 578 and adds 578 tests. Note that renamed tests count towards both.

org.eclipse.text.tests.AnnotationModelExtension2Test ‑ testAhead
org.eclipse.text.tests.AnnotationModelExtension2Test ‑ testAheadBehind
org.eclipse.text.tests.AnnotationModelExtension2Test ‑ testBehind
org.eclipse.text.tests.AnnotationModelExtension2Test ‑ testInside
org.eclipse.text.tests.AnnotationModelStressTest ‑ testStressTestMoveNew
org.eclipse.text.tests.AnnotationModelStressTest ‑ testStressTestMoveOld
org.eclipse.text.tests.AnnotationModelStressTest ‑ testStressTestPlainNew
org.eclipse.text.tests.AnnotationModelStressTest ‑ testStressTestPlainOld
org.eclipse.text.tests.ChildDocumentTest ‑ testAppend
org.eclipse.text.tests.ChildDocumentTest ‑ testDelete1
…

EclipseTextTestSuite AnnotationModelExtension2Test ‑ testAhead
EclipseTextTestSuite AnnotationModelExtension2Test ‑ testAheadBehind
EclipseTextTestSuite AnnotationModelExtension2Test ‑ testBehind
EclipseTextTestSuite AnnotationModelExtension2Test ‑ testInside
EclipseTextTestSuite AnnotationModelStressTest ‑ testStressTestMoveNew
EclipseTextTestSuite AnnotationModelStressTest ‑ testStressTestMoveOld
EclipseTextTestSuite AnnotationModelStressTest ‑ testStressTestPlainNew
EclipseTextTestSuite AnnotationModelStressTest ‑ testStressTestPlainOld
EclipseTextTestSuite ChildDocumentTest ‑ testAppend
EclipseTextTestSuite ChildDocumentTest ‑ testDelete1
…

This pull request removes 2 skipped tests and adds 2 skipped tests. Note that renamed tests count towards both.

org.eclipse.text.tests.FindReplaceDocumentAdapterTest ‑ _testRegexFindLinebreak2
org.eclipse.text.tests.FindReplaceDocumentAdapterTest ‑ _testRegexReplace

EclipseTextTestSuite FindReplaceDocumentAdapterTest ‑ _testRegexFindLinebreak2
EclipseTextTestSuite FindReplaceDocumentAdapterTest ‑ _testRegexReplace

♻️ This comment has been updated with latest results.

[akurtakov]

New warnings are caused by eclipse-platform/eclipse.platform.swt#2563. Merging.