feat: use default config path when no arg for -f is provided #14012

Job	Run time
check_if_release_branch	1s
towncrier_check	11s
changed_files	6s
build mirrord CLI	0s
check-rust-docs	1m 8s
integration_tests	13m 21s
lint	2m 13s
macos_tests	8m 7s
test_agent	3m 41s
test_agent_image	20s
test_cli_image	13m 47s
lint_markdown	0s
vscode_e2e_on_release_branch	0s
e2e (docker)	11m 59s
e2e (containerd)	13m 17s
intellij_e2e_on_release_branch	0s
ci	1s
	1h 8m 12s

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