Add eslint for `pr-checks` #7331

Job	Run time
Ruby analysis (ubuntu-latest, default)	47s
Ruby analysis (macos-latest, nightly-latest)	58s
Ruby analysis (ubuntu-latest, nightly-latest)	46s
Ruby analysis (macos-latest, default)	1m 11s
Ruby analysis (ubuntu-latest, linked)	50s
Ruby analysis (macos-latest, linked)	46s
	5m 18s

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