URW-210 Remove GroupMe bot usage

[Kenneth-W-Chen]

Replaces one usage of the GroupMe bot with the Discord bot since the GroupMe is unused

[sebastian-king]

Closing as part of reconciling prod drift. The work in these PRs was based on develop, which has since fallen ~282 commits behind the actual prod state (now on chore/reconcile-prod-drift). Prod already implements this functionality — generally in a newer/reworked form — so this PR is superseded. The branch is preserved, so nothing is lost and anything still useful can be cherry-picked. We're auditing each of these for any unique change worth incorporating before the reconcile branch merges into develop.