Testing: Provide default value for more environment variables in `setupActionsVars` #11618

Job	Run time
analyze-other (actions)	49s
analyze-other (python)	59s
check-codeql-versions	13s
analyze-javascript (ubuntu-22.04, linked)	4m 31s
analyze-javascript (ubuntu-24.04)	4m 26s
analyze-javascript (macos-15, linked)	6m 17s
analyze-javascript (windows-2025, linked)	5m 29s
analyze-javascript (macos-14, linked)	7m 9s
analyze-javascript (ubuntu-24.04, linked)	4m 21s
analyze-javascript (macos-15)	6m 25s
analyze-javascript (windows-2022)	5m 31s
analyze-javascript (ubuntu-22.04)	4m 30s
analyze-javascript (windows-2022, linked)	5m 20s
analyze-javascript (macos-14)	5m 32s
analyze-javascript (windows-2025)	6m 33s
	1h 8m 5s

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