Testing: Provide default value for more environment variables in `setupActionsVars` #2853

Job	Run time
Upload debug artifacts after failure in analyze (default)	3m 31s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 16s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	2m 16s
Upload debug artifacts after failure in analyze (linked)	3m 27s
Download and check debug artifacts after failure in analyze	14s
	12m 44s

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