GitLab Slack App - ability to post notification based on source commit author instead of user that triggered pipeline
<!--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=482535) </details> <!--IssueSummary end--> ### Problem to solve Currently, when a pipeline creation event _(for a [release](https://docs.gitlab.com/ee/user/project/releases/#creating-a-release-by-using-a-cicd-job) for example)_ sends out a notification via the GitLab Slack App, the notification messaging will contain the user that triggered the pipeline, in brackets. A user has requested the ability to configure these kinds of notifications so that the Slack notification shows the actual source commit author instead, particularly in cases where pipelines may be triggered by bot users but it's more desirable to see the actual source commit author.
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