RFR: 2509: Don't display duplicate jcheck warnings when the checks are displayed in Progress

[Zhao Song]

In the pull request body, we have a 'Progress' part which will display the progresses of some jchecks, however, if the jchecks in the progress fails as warning, it will also be displayed in 'Warning' part. It will confuse the users.

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Commit messages:
 - update
 - update
 - SKARA-2509

Changes: https://git.openjdk.org/skara/pull/1719/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1719&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2509
  Stats: 48 lines in 3 files changed: 47 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1719.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1719/head:pull/1719

PR: https://git.openjdk.org/skara/pull/1719