Remove obsolete CodeQL setup diagnostics #8538

Job	Run time
Ruby analysis (ubuntu-latest, nightly-latest)	42s
Ruby analysis (macos-latest, linked)	56s
Ruby analysis (macos-latest, nightly-latest)	1m 5s
Ruby analysis (ubuntu-latest, default)	41s
Ruby analysis (macos-latest, default)	43s
Ruby analysis (ubuntu-latest, linked)	38s
	4m 45s

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