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Fully migrate `pr-checks` to ESM #9222

Job	Run time
Ruby analysis (macos-latest, default)	1m 24s
Ruby analysis (ubuntu-latest, nightly-latest)	37s
Ruby analysis (ubuntu-latest, default)	46s
Ruby analysis (macos-latest, linked)	1m 16s
Ruby analysis (ubuntu-latest, linked)	46s
Ruby analysis (macos-latest, nightly-latest)	1m 15s
	6m 4s