[SPARK-45031][INFRA] Choose the right merge code path and merge hash for reopened PRs #42749
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What changes were proposed in this pull request?
When determining to cherry-pick a PR, we also check the PR is in the closed state; Otherwise, we assume it gets reverted and reopened, and we go normal merging.
When cherry-picking, we shall select the merge hash from the latest commit-close event instead of the oldest. This is a bug fix
Why are the changes needed?
Bugfix
Does this PR introduce any user-facing change?
no
How was this patch tested?
mutually
Was this patch authored or co-authored using generative AI tooling?
no