Make our Slack app enterprise grid compatible
<!--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=376236) </details> <!--IssueSummary end--> ### About In order for our app to be installed at the organization-level of [Slack enterprise grid](https://api.slack.com/enterprise/grid) we will need to configure the Slack app and refactor the ~backend. See these resources: - https://api.slack.com/enterprise/apps - https://api.slack.com/enterprise/grid
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