Draft: Migrate Fulfillment issues and MRs

Migration

1. Rename ~"group::fulfillment" to devopsfulfillment
2. Migrate current devopsfulfillment + frontend issues/MRs to sectionfulfillment + ~"group::purchase" - sectiongrowth - devopsgrowth in gitlab-org/gitlab
   • Dry run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/774953718. Expected updates: 78 issues, 100 MRs.
   • One-off run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/775382807. 32 open issues, 46 closed issues, 4 open MRs, 14 closed MRs, 82 merged MRs updated.
3. Migrate current devopsfulfillment + backend issues/MRs to sectionfulfillment + groupprovision - sectiongrowth - devopsgrowth in gitlab-org/customers-gitlab-com
   • Dry run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/788421388. Expected updates: 51 open issues, 377 closed issues, 5 open MRs, 41 closed MRs, 433 merged MRs.
4. Migrate current devopsfulfillment issues/MRs to sectionfulfillment + groupprovision - sectiongrowth - devopsgrowth in gitlab-org/license-gitlab-com
   • Dry run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/769726387. Expected updates: 110 issues, 76 MRs
   • One-off runs: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/775728862 (retried as it failed on first try: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/775741007). 35 open issues, 75 closed issues, 2 open MRs, 5 closed MRs, 69 merged MRs updated.

Relates to #571 (closed).