Testing: Provide default value for more environment variables in `setupActionsVars` #11629

Job	Run time
analyze-other (python)	1m 3s
check-codeql-versions	12s
analyze-other (actions)	51s
analyze-javascript (ubuntu-24.04, linked)	4m 37s
analyze-javascript (windows-2025)	6m 45s
analyze-javascript (macos-14, linked)	6m 18s
analyze-javascript (ubuntu-24.04)	4m 30s
analyze-javascript (windows-2022)	5m 20s
analyze-javascript (windows-2022, linked)	5m 22s
analyze-javascript (ubuntu-22.04, linked)	4m 26s
analyze-javascript (macos-14)	6m 10s
analyze-javascript (ubuntu-22.04)	4m 35s
analyze-javascript (windows-2025, linked)	8m 37s
analyze-javascript (macos-15, linked)	8m 25s
analyze-javascript (macos-15)	8m 36s
	1h 15m 47s

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