RFR: 2566: When rfr is pending on other workItems, the pr bot shouldn't actively remove the label

[Zhao Song]

I restarted the pr bot today and a user reported that the pr bot removed 'rfr' label on a pull request. It's the side effect of [SKARA-2552](https://bugs.openjdk.org/browse/SKARA-2552), when the bot was evaluating the pull request, the labelerWorkItem wasn't done, so rfrPendingOnOtherWorkItems was set to true. In this case, the bot should just not add 'rfr' label, but not actively remove the 'rfr' label

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Commit messages:
 - update
 - SKARA-2566

Changes: https://git.openjdk.org/skara/pull/1732/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1732&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2566
  Stats: 13 lines in 1 file changed: 6 ins; 7 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1732.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1732/head:pull/1732

PR: https://git.openjdk.org/skara/pull/1732