Fix fs policy test. #13791

Job	Run time
towncrier_check	10s
check_if_release_branch	1s
changed_files	10s
build mirrord CLI	0s
test_agent	3m 15s
check-rust-docs	1m 9s
integration_tests	3m 33s
lint	3m 21s
macos_tests	3m 33s
test_agent_image	3m 24s
test_cli_image	3m 26s
lint_markdown	0s
vscode_e2e_on_release_branch	1s
intellij_e2e_on_release_branch	1s
e2e	1s
ci	1s
	22m 6s

Provide feedback