Skip uploading dependency caches if we know they exist #6334

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 16s
Ruby analysis (ubuntu-latest, linked)	53s
Ruby analysis (macos-latest, default)	1m 10s
Ruby analysis (ubuntu-latest, nightly-latest)	47s
Ruby analysis (macos-latest, linked)	1m 21s
Ruby analysis (ubuntu-latest, default)	48s
	6m 15s

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