Ignore certain authors from slack notifications
<!--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=353372) </details> <!--IssueSummary end--> We have a slack channel for getting all code reviews, comments, merges and prs opened. This is like a code news feed, and allows managers a high level view. Since we have processes doing automatic push, the channel has become noisy. I would like to ignore them somehow and get notifications only for the other users. I.e. ignore certain authors in slack notifications.
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