Convert `update-release-branch.py` to TypeScript #4129

Job	Run time
Upload debug artifacts (stable-v2.20.3)	6m 12s
Upload debug artifacts (linked)	5m 37s
Upload debug artifacts (default)	5m 45s
Upload debug artifacts (nightly-latest)	5m 55s
Download and check debug artifacts	8s
	23m 37s

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