Integrated: 839: GitHub actions test results not always added to a PR

[Robin Westberg]

The test info propagator did not take changes to a PR's head hash into account.

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Commit messages:
 - Ensure that test info expiration times are reset if the PR head hash changes

Changes: https://git.openjdk.java.net/skara/pull/967/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=967&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-839
  Stats: 70 lines in 2 files changed: 65 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/skara/pull/967.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/967/head:pull/967

PR: https://git.openjdk.java.net/skara/pull/967