Do not nullify epic parent in groups transfer service
What does this MR do and why?
Related to #373977 (closed)
With &8502 (closed) we allow cross-group epics so when transferring a group it's not necessary to check for the epics' parent validity anymore.
The feature is still behind the feature flag child_epics_from_different_hierarchies
so we need to support the previous behavior when the flag is disabled.
With #382719 (closed) all methods and tests for nullifying epic parents during a group transfer can be removed (I added TODO inline).
MR acceptance checklist
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Edited by Eugenia Grieff