Convert release-branches.py and update-required-checks.sh to TypeScript
#7439
| Job | Run time |
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| 1m 26s | |
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| 1m 28s | |
| 1m 22s | |
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| 5m 48s | |
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| 1m 22s | |
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| 7m 57s | |
| 26m 31s |