Add policy to exclude env vars. (#2993) #13670

Job	Run time
towncrier_check	7s
changed_files	7s
check_if_release_branch	1s
build mirrord CLI	0s
check-rust-docs	4m 24s
integration_tests	14m 30s
macos_tests	33m 34s
test_agent	3m 18s
lint	12m 21s
test_agent_image	6m 34s
test_cli_image	15m 7s
lint_markdown	0s
e2e (docker)	13m 52s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
e2e (containerd)	13m 48s
ci	1s
	1h 57m 44s

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