Convert `update-release-branch.py` to TypeScript #4124

Job	Run time
Upload debug artifacts (stable-v2.20.3)	6m 15s
Upload debug artifacts (default)	5m 22s
Upload debug artifacts (nightly-latest)	5m 29s
Upload debug artifacts (linked)	4m 27s
Download and check debug artifacts	9s
	21m 42s

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