RFR: 2051: Use real target ref to determine whether this pr needs maintainer approval in CheckWorkItem

Mon Oct 2 18:45:51 UTC 2023

On Mon, 2 Oct 2023 17:46:24 GMT, Zhao Song <zsong at openjdk.org> wrote:

> After deployed [SKARA-2045](https://bugs.openjdk.org/browse/SKARA-2045) to production, I found that some dependent pull requests are still not updated. Then I realized that in CheckWorkItem, we also need to use real target ref to determine whether this pr needs maintainer approval.

Marked as reviewed by erikj (Lead).

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PR Review: https://git.openjdk.org/skara/pull/1566#pullrequestreview-1653293437