Improve `Env` abstraction #12737

Job	Run time
analyze-other (actions)	49s
analyze-other (python)	48s
check-codeql-versions	12s
analyze-javascript (ubuntu-24.04, linked)	2m 51s
analyze-javascript (ubuntu-24.04)	4m 10s
analyze-javascript (ubuntu-22.04)	3m 41s
analyze-javascript (ubuntu-22.04, linked)	4m 40s
analyze-javascript (macos-14-xlarge, linked)	2m 23s
analyze-javascript (macos-15-xlarge)	2m 29s
analyze-javascript (windows-2022)	6m 6s
analyze-javascript (windows-2025)	6m 15s
analyze-javascript (macos-15-xlarge, linked)	2m 24s
analyze-javascript (macos-14-xlarge)	2m 27s
analyze-javascript (windows-2025, linked)	7m 1s
analyze-javascript (windows-2022, linked)	6m 11s
	52m 27s

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