don't report error on notimplemented, might fix go crash #14047

Job	Run time
check_if_release_branch	1s
changed_files	7s
towncrier_check	7s
build mirrord CLI	0s
check-rust-docs	1m 9s
integration_tests	5m 55s
lint	3m 11s
lint_markdown	0s
macos_tests	10m 54s
test_agent	3m 23s
test_cli_image	6m 23s
test_agent_image	6m 40s
intellij_e2e_on_release_branch	0s
e2e (docker)	10m 45s
vscode_e2e_on_release_branch	0s
e2e (containerd)	8m 44s
ci	1s
	57m 20s

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