Remove moving milestone reports and fix moving when closing milestone

This does two things:

• Remove moving milestone reports, because we should rather improve logging: #344 (closed)
• Fix that so it only moves the milestone when it's closed

Why this can fix the bug can be found at: #343 (comment 232241702)

Dry-run:

• https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/324696131
• Adding missed:12.4:
  • https://gitlab.com/gitlab-org/gitlab/issues/33897
  • https://gitlab.com/gitlab-org/gitlab/merge_requests/9306
• Moving from 12.4: The milestone is still open yet, so nothing will be moved for now
  • Ran another dry-run with gitlab-org/gitlab-triage: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/324718110
  • It correctly found https://gitlab.com/gitlab-org/gitlab-triage/issues/145 and want to run /milestone %"12.4"

Closes #343 (closed)