feat: use default config path when no arg for -f is provided (#2939) #14024

Job	Run time
check_if_release_branch	1s
towncrier_check	8s
changed_files	6s
build mirrord CLI	0s
test_agent	3m 27s
lint	3m 24s
test_agent_image	6m 51s
check-rust-docs	58s
integration_tests	13m 32s
test_cli_image	15m 42s
macos_tests	19m 53s
lint_markdown	0s
e2e (docker)	11m 26s
e2e (containerd)	11m 17s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
ci	1s
	1h 26m 46s

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