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Convert most remaining CI scripts to TypeScript in `pr-checks` #322

Job	Run time
Per-language bundles (actions, ubuntu-latest, nightly-latest, actions javascript)	46s
Per-language bundles (go, ubuntu-latest, nightly-latest, autobuild)	54s
Per-language bundles (python, ubuntu-latest, nightly-latest)	50s
Per-language bundles (ruby, ubuntu-latest, nightly-latest)	41s
Per-language bundles (java, ubuntu-latest, nightly-latest, none)	58s
Per-language bundles (javascript, ubuntu-latest, nightly-latest)	46s
Per-language bundles (csharp, ubuntu-latest, nightly-latest, none)	59s
Per-language bundles (cpp, ubuntu-latest, nightly-latest, manual, gcc -o main main.c)	47s
Per-language bundles (swift, macos-latest-xlarge, nightly-latest, autobuild)	7m 58s
Per-language bundles (rust, ubuntu-latest, nightly-latest)	1m 40s
	16m 19s