Convert `update-release-branch.py` to TypeScript #4138

Job	Run time
Upload debug artifacts (stable-v2.20.3)	5m 37s
Upload debug artifacts (default)	5m 46s
Upload debug artifacts (linked)	6m 0s
Upload debug artifacts (nightly-latest)	5m 30s
Download and check debug artifacts	6s
	22m 59s

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