Fix Actions pull_request.paths being triggered incorrectly by rebase
#36045
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Partially fix #34710
The bug described in #34710 can be divided into two parts:
push.pathsandpull_request.paths. This PR fixes the issue related topull_request.paths. The root cause is that the check for whether the workflow can be triggered happens before updating the PR’s merge base. This causes the file-change detection to use the old merge base. Therefore, we need to update the merge base first and then check whether the workflow can be triggered.