RFR: 2331: Improve review notes

[Pavel Rappo]

There are two variants of a note that can be added to an item in the "Reviewers" list of a PR body:

  - 🔄 Re-review required ...
  - ⚠️ Review applies to ...

That note may confuse or draw unneeded attention to the PR body.

Firstly, as a result of recently integrated [SKARA-2312][], "⚠️ Review applies to ..." is also added to an item (i.e. review) that applies to the head of the PR. Secondly, "🔄 Re-review required (review applies to ..." may be present for some items even though a PR has the green "ready" label.

[SKARA-2312]: https://bugs.openjdk.org/browse/SKARA-2312

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Commit messages:
 - Don't add "Re-review required" if reviewed
 - Don't add "Review applies to" to the head of a PR

Changes: https://git.openjdk.org/skara/pull/1679/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1679&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2331
  Stats: 31 lines in 3 files changed: 18 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/skara/pull/1679.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1679/head:pull/1679

PR: https://git.openjdk.org/skara/pull/1679