Provide JUnit5 replacements for Junit4 rules

[vogella]

Only CloseTestWindowsRule has a direct replacement named CloseTestWindowsExtension (located in the same package: org.eclipse.ui.tests.harness.util).

Here is the status for the other rules:

• PreferenceMementoRule: No JUnit 5 replacement found.
• HeadlessApplicationRule: No JUnit 5 replacement found.
• WorkbenchContextRule: No JUnit 5 replacement found.
• JFaceActionRule: No JUnit 5 replacement found.
• UIPerformanceTestRule: No JUnit 5 replacement found.
• BindingTestSetup: No JUnit 5 replacement found.
• SwtLeakTestWatcher: No direct replacement found (though CloseTestWindowsExtension incorporates similar leak checking logic).
• TestFailReporter: No JUnit 5 replacement found.

[vogella]

JFaceActionRule- #3630

[vogella]

SwtLeakTestWatcher #3634

[vogella]

PreferenceMementoRule #3612

[vogella]

WorkbenchContextRule #3635