Draft: Add new label for .mailmap and verified commits

What does this MR do and why?

Adds a new label for commits which are verified but have a commit author email which is not verified to the commiter.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

Follow the description in https://gitlab.com/gitlab-org/gitlab/-/issues/425042 to setup a mailmap user mapping.

See verified commits which were previously labels as verified now labelled as ⚠ Verified with an orange label.

Hovering over the label:

Related to #425042