Add eslint for `pr-checks` #7328

Job	Run time
Ruby analysis (macos-latest, default)	49s
Ruby analysis (macos-latest, linked)	50s
Ruby analysis (ubuntu-latest, default)	50s
Ruby analysis (macos-latest, nightly-latest)	58s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (ubuntu-latest, linked)	53s
	5m 10s

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