RFR: 1562: The method 'CheckRun#findComment' don't need the comment list as parameter

[Zhao Song]

remove parameter 'comments' in CheckRun#findComment

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Commit messages:
 - refactor code related with activeReviews in CheckRun
 - remove parameter 'comments' in CheckRun#findComment

Changes: https://git.openjdk.org/skara/pull/1375/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1375&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1562
  Stats: 25 lines in 1 file changed: 0 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/skara/pull/1375.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1375/head:pull/1375

PR: https://git.openjdk.org/skara/pull/1375