RFR: 2479: PR marked as ready with jcheck error

[Zhao Song]

Currently, when determining if a PR is ready, if the PR doesn't require a review, it also ignores all jcheck failures. Instead, only reviewers check should be ignored in this case.

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

Commit messages:
 - add test
 - update
 - SKARA-2479

Changes: https://git.openjdk.org/skara/pull/1714/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1714&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2479
  Stats: 76 lines in 2 files changed: 75 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1714.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1714/head:pull/1714

PR: https://git.openjdk.org/skara/pull/1714