Add eslint for `pr-checks` #7321

Job	Run time
Ruby analysis (macos-latest, linked)	1m 0s
Ruby analysis (macos-latest, default)	1m 2s
Ruby analysis (macos-latest, nightly-latest)	1m 19s
Ruby analysis (ubuntu-latest, default)	52s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (ubuntu-latest, linked)	51s
	5m 54s

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