[crac] RFR: 8354679: [CRaC] jdk.crac.management makes JdkManagementCheckSince fail [v2]

[Timofei Pushkin]

> Fixes the failing test, by using `@since CRaC` in CRaC docs and `--ignoreSince` in since-checker tests which check them.
> 
> A since-checker test for `jdk.crac` module is also added but it is disabled until [JDK-8354921](https://bugs.openjdk.org/browse/JDK-8354921) is fixed.
> 
> Also adds the since-checking tests to CI.

Timofei Pushkin 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 four additional commits since the last revision:

 - Fix since checker test with ignoreSince
 - Revert "Fix since checker test"
   
   This reverts commit a4fb97899d8c6d8667b355feac655dcd6875780b.
 - Merge remote-tracking branch 'openjdk-crac/crac' into since-checker
 - Fix since checker test

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

Changes:
  - all: https://git.openjdk.org/crac/pull/225/files
  - new: https://git.openjdk.org/crac/pull/225/files/a4fb9789..e690c7d1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=225&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=225&range=00-01

  Stats: 228105 lines in 5687 files changed: 113879 ins; 90749 del; 23477 mod
  Patch: https://git.openjdk.org/crac/pull/225.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/225/head:pull/225

PR: https://git.openjdk.org/crac/pull/225