Add reason why cherry-pick failed
When a merge request does not have a P1 or P2 label, it will not get cherry-picked but the bot will not include an explanation why. Instead of this:
@liz.lemon This merge request could not automatically be picked into
`11-4-stable` for `11.4.1`. This requires manual intervention.
Please refer to
[GitLab.com releases](https://about.gitlab.com/handbook/engineering/releases/#gitlabcom-releases-2)
/unlabel ~"Pick into 11.4"
We now see:
@liz.lemon This merge request could not automatically be picked into
`11-4-stable` for `11.4.1`:
* Merge request does not have P1 or P2 label
This requires manual intervention.
Please refer to
[GitLab.com releases](https://about.gitlab.com/handbook/engineering/releases/#gitlabcom-releases-2)
/unlabel ~"Pick into 11.4"