feat: Allow passing in an epic parent_id when updating epics
requested to merge espadav8/gitlab:348123-update-epic-api-does-not-support-passing-in-a-parent_id-or-parent_iid-option into master
What does this MR do and why?
Allow passing in parent_id when updating an epic, to change its parent.
MR acceptance checklist
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Related to #348123 (closed)
Edited by charlie ablett