Fix fs policy test. #13794

Job	Run time
check_if_release_branch	1s
towncrier_check	7s
changed_files	8s
build mirrord CLI	0s
check-rust-docs	58s
lint	3m 22s
macos_tests	17m 11s
integration_tests	12m 49s
test_agent	3m 15s
test_cli_image	6m 29s
test_agent_image	6m 22s
lint_markdown	0s
e2e (docker)	11m 13s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
e2e (containerd)	12m 3s
ci	1s
	1h 13m 59s

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