RFR: 1999: Only post ApprovalNeededComment after pr is otherwise ready for integration

[Zhao Song]

In [SKARA-1199](https://bugs.openjdk.org/browse/SKARA-1199), I made a bug about posting approvalNeededComment. 

Before the bot posting ApprovalNeededComment, we need to make sure this pr could pass all the checks.

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Commit messages:
 - SKARA-1999

Changes: https://git.openjdk.org/skara/pull/1546/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1546&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1999
  Stats: 3 lines in 3 files changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1546.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1546/head:pull/1546

PR: https://git.openjdk.org/skara/pull/1546