feat: actionable error message for BREAKING CHANGE subject

[abitrolly]

Expected Behavior

⧗   input: BREAKING CHANGE: use recommended `heroku/builder:22`
https://github.com/heroku/cnb-builder-images#available-images
✖   move BREAKING CHANGE to footer [change-in-subject]
✖   add type [type-empty]
✖   add subject [subject-empty]
✖   found 2 problems, 0 warnings

Current Behavior

⧗   input: BREAKING CHANGE: use recommended `heroku/builder:22`
https://github.com/heroku/cnb-builder-images#available-images
✖   subject may not be empty [subject-empty]
✖   type may not be empty [type-empty]
✖   found 2 problems, 0 warnings

Affected packages

• cli
• core
• prompt
• config-angular

Possible Solution

No response

Context

https://gitlab.com/gitlab-org/cluster-integration/auto-build-image/-/merge_requests/159#note_1672887099

[escapedcat]

Happy for a PR.
You can always use the ! option.