GitLab Slack app: hide username
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=408654) </details> <!--IssueSummary end--> ### Proposal The GitLab for Slack app is great, and it's really useful to have it alert the team about failing pipelines on main branch, but having the username of the unfortunate developer as a big bold header feels like public shaming. _What_ has broken should always be more important than _who_ "broke" it. So would be really awesome if you could e.g. switch placement of username with that of project name, or maybe even have some option to hide the username completely (showing the commit message should be enough in most cases).
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