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Fully migrate `pr-checks` to ESM #11282

Job	Run time
Split workflow (macos-latest, nightly-latest)	2m 14s
Split workflow (macos-latest, linked)	2m 10s
Split workflow (ubuntu-latest, default)	1m 18s
Split workflow (ubuntu-latest, linked)	59s
Split workflow (ubuntu-latest, nightly-latest)	1m 8s
Split workflow (macos-latest, default)	2m 14s
	10m 3s