Cleanup workflow - part 1 (#42023)
* part 1
* part 2
* part 3
* part 4
* part 5
* fix 1
* check 1
* part 6
* part 7
* part 8
* part 9
* part 10: rename file
* OK: new_model_pr_merged_notification.yml
* part 11
* fix 2
* revert check
* fix
* fix
* fix
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Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>
