Remove legacy issue promote service (!202783) · Merge requests · GitLab.org / GitLab

What does this MR do and why?

Remove legacy issue promote service

Removes the use_data_sync_for_issue_promotion feature flag and with it the old Epics::IssuePromoteService. It now uses the DataSync services underneath to promote issues to epics (and copy over the data).

Since Issuable::Clone::BaseService is then also no longer used, we can also delete this code.

Changelog: removed EE: true

References

FF rollout issue: #556206 (closed)
#556211 (closed)

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