Remove accepting merge requests

What does this MR do and why?

See https://gitlab.com/gitlab-org/quality/contributor-success/team/-/issues/83

We have identified that the ~"Accepting merge requests" label is overused to a point it no longer holds value.

This MR removes its use from automations.

Dry runs:

• https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3281367023
• https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3288961863

Expected impact & dry-runs

These are strongly recommended to assist reviewers and reduce the time to merge your change.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/tree/master/doc/scheduled#testing-with-a-dry-run on how to perform dry-runs.

Action items

• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review