Remove empty hamcrest-core 2.x from 'JUnit 4/5' classpath container

[HannesWell]

What it does

Since hamcrest version 2 the 'hamcrest-core' artifact only exists to redirect to the new 'hamcrest' artifact containing all of hamcrest. Therefore 'hamcrest-core' does only contains meteadata but no classes. For the 'JUnit 4/5' classpath container it is therefore useless in version 2 and later.

References:

• https://hamcrest.org/JavaHamcrest/distributables.html#previous-versions-of-hamcrest
• https://github.com/hamcrest/JavaHamcrest/releases/tag/v2.1

Author checklist

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

[akurtakov]

Will you handle removing it entirely from the sdk/builds?

[HannesWell]

Will you handle removing it entirely from the sdk/builds?

Yes, I'll check if there are any remaining's of hamcrest-core that we can remove.

[HannesWell]

Will you handle removing it entirely from the sdk/builds?

See

• https://github.com/eclipse-platform/eclipse.platform.releng.aggregator/pull/2343

For JDT the remaining references to hamcrest-core were already removed as part of

• https://github.com/eclipse-jdt/eclipse.jdt/pull/107