Migrate org.eclipse.ui.tests.forms 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

 2 925 files  +15   2 925 suites  +15   2h 6m 8s ⏱️ - 6m 45s
 8 166 tests ± 0   7 921 ✅ + 1  245 💤 ±0  0 ❌  - 1 
23 568 runs  ± 0  22 786 ✅ + 1  782 💤 ±0  0 ❌  - 1 

Results for commit 29049d6. ± Comparison against base commit ca934b3.

This pull request removes 131 and adds 131 tests. Note that renamed tests count towards both.

org.eclipse.ui.tests.forms.events.ExpansionListenerTest ‑ callsExpansionStateChangedConsumer
org.eclipse.ui.tests.forms.events.ExpansionListenerTest ‑ callsExpansionStateChangingConsumer
org.eclipse.ui.tests.forms.events.ExpansionListenerTest ‑ throwsNullPointerOnNullStateChangedAdapter
org.eclipse.ui.tests.forms.events.ExpansionListenerTest ‑ throwsNullPointerOnNullStateChangingAdapter
org.eclipse.ui.tests.forms.events.HyperLinkListenerTest ‑ callsActivatedConsumer
org.eclipse.ui.tests.forms.events.HyperLinkListenerTest ‑ callsEnteredConsumer
org.eclipse.ui.tests.forms.events.HyperLinkListenerTest ‑ callsExitedConsumer
org.eclipse.ui.tests.forms.events.HyperLinkListenerTest ‑ throwsNullPointerOnNullActivatedAdapter
org.eclipse.ui.tests.forms.events.HyperLinkListenerTest ‑ throwsNullPointerOnNullEnteredAdapter
org.eclipse.ui.tests.forms.events.HyperLinkListenerTest ‑ throwsNullPointerOnNullExitedAdapter
…

AllFormsTests AllEventsTests ExpansionListenerTest ‑ callsExpansionStateChangedConsumer
AllFormsTests AllEventsTests ExpansionListenerTest ‑ callsExpansionStateChangingConsumer
AllFormsTests AllEventsTests ExpansionListenerTest ‑ throwsNullPointerOnNullStateChangedAdapter
AllFormsTests AllEventsTests ExpansionListenerTest ‑ throwsNullPointerOnNullStateChangingAdapter
AllFormsTests AllEventsTests HyperLinkListenerTest ‑ callsActivatedConsumer
AllFormsTests AllEventsTests HyperLinkListenerTest ‑ callsEnteredConsumer
AllFormsTests AllEventsTests HyperLinkListenerTest ‑ callsExitedConsumer
AllFormsTests AllEventsTests HyperLinkListenerTest ‑ throwsNullPointerOnNullActivatedAdapter
AllFormsTests AllEventsTests HyperLinkListenerTest ‑ throwsNullPointerOnNullEnteredAdapter
AllFormsTests AllEventsTests HyperLinkListenerTest ‑ throwsNullPointerOnNullExitedAdapter
…