Skip uploading dependency caches if we know they exist #6331

Job	Run time
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.17.6)	1m 3s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.20.7)	1m 23s
Go: tracing with autobuilder step (macos-latest, stable-v2.18.4)	3m 39s
Go: tracing with autobuilder step (macos-latest, stable-v2.17.6)	3m 29s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.18.4)	1m 34s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.22.4)	1m 35s
Go: tracing with autobuilder step (macos-latest, stable-v2.19.4)	3m 22s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.21.4)	1m 59s
Go: tracing with autobuilder step (macos-latest, stable-v2.20.7)	3m 37s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.19.4)	1m 27s
Go: tracing with autobuilder step (macos-latest, stable-v2.22.4)	2m 55s
Go: tracing with autobuilder step (macos-latest, stable-v2.21.4)	2m 49s
Go: tracing with autobuilder step (macos-latest, default)	2m 26s
Go: tracing with autobuilder step (ubuntu-latest, default)	55s
Go: tracing with autobuilder step (ubuntu-latest, nightly-latest)	1m 10s
Go: tracing with autobuilder step (macos-latest, nightly-latest)	3m 44s
Go: tracing with autobuilder step (ubuntu-latest, linked)	1m 18s
Go: tracing with autobuilder step (macos-latest, linked)	3m 21s
	41m 46s

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