Add policy to exclude env vars. #13664

Job	Run time
towncrier_check	11s
check_if_release_branch	1s
changed_files	7s
build mirrord CLI	0s
lint	2m 57s
test_agent_image	2m 21s
integration_tests	3m 3s
check-rust-docs	2m 47s
macos_tests	4m 3s
test_agent	2m 18s
test_cli_image	2m 20s
lint_markdown	0s
vscode_e2e_on_release_branch	1s
intellij_e2e_on_release_branch	1s
e2e	1s
ci	1s
	20m 12s

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