Add policy to exclude env vars. #13614

Job	Run time
changed_files	6s
towncrier_check	8s
check_if_release_branch	1s
build mirrord CLI	0s
check-rust-docs	2m 5s
integration_tests	11m 56s
macos_tests	17m 53s
test_agent	3m 18s
lint	10m 30s
test_agent_image	6m 21s
test_cli_image	5m 57s
lint_markdown	0s
e2e (docker)	14m 40s
vscode_e2e_on_release_branch	0s
e2e (containerd)	13m 47s
intellij_e2e_on_release_branch	0s
ci	1s
	1h 26m 43s

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