RFR: 8288499: Restore cancel-in-progress in GHA

Wed Jun 15 15:28:41 UTC 2022

I accidentally changed the behavior in GHA wrt multiple runs from the same branch. The old solution used `cancel-in-progress: true` which means that an old batch was cancelled when a new commit was pushed to the branch.

I think this is a good behavior, since it minimizes wait times for GHA results, and wastes less GHA resources.

I changed this to `false` while developing the new GHA framework, and intended to change it back before pushing, but forgot about it.

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Commit messages:
 - 8288499: Restore cancel-in-progress in GHA

Changes: https://git.openjdk.org/jdk/pull/9170/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9170&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288499
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9170.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9170/head:pull/9170

PR: https://git.openjdk.org/jdk/pull/9170