[crac] RFR: Add CRaC-specific tests to GHA [v2]

[Radim Vansa]

> Existing GitHub Actions run test tier1 but since most changes in this project focus on the CRaC capabilities we should run them in an automated fashion, too.
> Right now the tests are mostly failing: this should be addressed in https://github.com/openjdk/crac/pull/47

Radim Vansa has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge remote-tracking branch 'origin/crac' into test-crac-in-gha
 - Add CRaC-specific tests to GHA

-------------

Changes:
  - all: https://git.openjdk.org/crac/pull/48/files
  - new: https://git.openjdk.org/crac/pull/48/files/a3e77b56..8a9bb6e0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=48&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=48&range=00-01

  Stats: 565 lines in 29 files changed: 510 ins; 16 del; 39 mod
  Patch: https://git.openjdk.org/crac/pull/48.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/48/head:pull/48

PR: https://git.openjdk.org/crac/pull/48