Add support including test target platform for Eclipse 2024-03 (v4.31) platform

[scottkurz]

Checklists

(From https://github.com/OpenLiberty/liberty-tools-eclipse/wiki/Fix-Release-Checklist)

Dependencies

• Update LCLS Dep
  • Ensure Liberty XSDs are updated
• Update LSP4MP?
• Update LSP4Jakarta?
• Update lsp4e/lsp4j deps?
• Update jdtls deps?
• Update other Category.xml / feature.xml deps?

Tracking

• Milestone - e.g. https://github.com/OpenLiberty/liberty-tools-eclipse/milestone/4
• Release Plan - https://github.com/orgs/openLiberty/projects/21 (make sure it includes the Milestone highlights so we can bubble up the most important elements to a broader view of Liberty Tools / DevEx work).
• Epic issue (this issue)

Test Level

• target platform file (copy from last version, update URLs, Ctrl+Space to populate new versions, try to align version with target Eclipse install like with Mend scan contents)
• default level in POM
• default level GHA
• default level Jenkins
• Better to test vs. multiple levels in any of these envs or just one?

Other releng

(See https://github.com/OpenLiberty/liberty-tools-eclipse/wiki/Release-build-process)

• Mend/Whitesource scan (see instructions in ci/scans/dependency-only-mend-pom.xml)
• Static app scan
• Update NOTICE file after dep scan (skipped for next time).
• Doc update
• Eclipse Marketplace entry
• Update CHANGELOG.md. (Try GH 'compare', e.g. this.)

[scottkurz]

Much has been done by #507 but not 100% necessarily