RFR: 1588: Bridge messages should not be sent for PRs in draft state [v5]

[Guoxiong Li]

> Hi all,
> 
> This patch prevents the `mailling bridge bot` from sending emails when a PR is draft.
> And the related test case is added.
> 
> Thanks for taking the time to review.
> 
> Best Regards,
> -- Guoxiong

Guoxiong Li has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge branch 'master' into SKARA-1588
   
   # Conflicts:
   #	forge/src/test/java/org/openjdk/skara/forge/gitlab/GitLabRestApiTest.java
 - Use max method instead of reduce
 - Move the last draft invocation out of the method 'ignoreComment'. Adjust the API implementation.
 - Filter the comments in method ArchiveWorkItem#ignoreComment
 - SKARA-1588

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Changes: https://git.openjdk.org/skara/pull/1469/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1469&range=04
  Stats: 257 lines in 10 files changed: 242 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/skara/pull/1469.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1469/head:pull/1469

PR: https://git.openjdk.org/skara/pull/1469