Add policy to exclude env vars. #13667

Job	Run time
check_if_release_branch	1s
towncrier_check	7s
changed_files	6s
build mirrord CLI	0s
check-rust-docs	1m 4s
test_agent_image	6m 25s
integration_tests	12m 14s
lint	1m 2s
macos_tests	14m 20s
test_agent	3m 18s
test_cli_image	6m 31s
lint_markdown	0s
vscode_e2e_on_release_branch	0s
intellij_e2e_on_release_branch	0s
e2e (docker)	7m 55s
e2e (containerd)	7m 56s
ci	1s
	1h 1m 0s

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