Copilot/add context menu for disabled tests

[carstenartur]

What it does

Adds a Quick Assist Processor that provides context menu actions to disable and enable JUnit test methods in Eclipse JDT.

Features

Detects JUnit test methods (both JUnit 4 and JUnit 5)
Supports JUnit 5 parameterized tests (@ParameterizedTest)
Supports JUnit 5 repeated tests (@RepeatedTest)
Supports JUnit 5 test factories (@testfactory)
Supports JUnit 5 test templates (https://github.com/testtemplate)
Offers to add @disabled (JUnit 5) or @ignore (JUnit 4) annotations to disable tests
Offers to remove these annotations to enable disabled tests
Automatically handles imports for the annotations
How to Use

Place cursor on a JUnit test method (annotated with @test, @ParameterizedTest, @RepeatedTest, etc.)
Press Ctrl+1 (or Cmd+1 on Mac) to open the Quick Assist menu
Select "Disable test with @disabled" or "Disable test with @ignore"
To enable a disabled test, select "Enable test (remove @disabled)" or "Enable test (remove @ignore)"
Implementation

JUnitQuickAssistProcessor: Detects test methods and provides appropriate proposals
AddAnnotationProposal: Adds @disabled or @ignore annotation to test methods
RemoveAnnotationProposal: Removes @disabled or @ignore annotation from test methods
Registered as a Quick Assist Processor in plugin.xml
All message strings properly externalized in JUnitMessages.properties
Annotation Logic

@disabled is used for JUnit 5 tests (methods annotated with org.junit.jupiter.api.Test, @ParameterizedTest, @RepeatedTest, @testfactory, or @testtemplate)
@ignore is used for JUnit 4 tests (methods annotated with org.junit.Test)

How to test

Add @disabled to JUnit 5 test
Remove @disabled from JUnit 5 test
Add @ignore to JUnit 4 test
Remove @ignore from JUnit 4 test
No proposals for non-test methods
Add @disabled to parameterized test (@ParameterizedTest)
Add @disabled to repeated test (@RepeatedTest)

Author checklist

• I have thoroughly tested my changes
• The change is following the coding conventions
• [x ] I have signed the Eclipse Contributor Agreement (ECA)