Skip uploading dependency caches if we know they exist #6330

Job	Run time
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	2m 58s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 7s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 19s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 44s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 44s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 18s
Go: tracing with custom build steps (macos-latest, default)	2m 30s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 36s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 19s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 23s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 0s
Go: tracing with custom build steps (ubuntu-latest, default)	1m 11s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 32s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	3m 16s
Go: tracing with custom build steps (macos-latest, linked)	3m 12s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 56s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	1m 9s
Go: tracing with custom build steps (ubuntu-latest, linked)	1m 4s
	36m 18s

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