[FEATURE] --fail-only

[domdomegg]

Is there an existing issue for this?

• I have searched the existing issues

Have you read the CONTRIBUTING guide on posting issues, and CODE_OF_CONDUCT?

• yes I read the things

Description

In fastify/fastify#5222 I accidentally left in some { only: true } annotations from when I was running tests locally.

Usually the main use of only (I think?) is for running tests locally quickly, and they're not intended to be checked into git.

It'd be useful to have a --fail-only (to mirror --fail-todo and --fail-skip) to be run in CI where the only annotation is not expected.

Example

No response