Remove custom init for issue internal IDs
What does this MR do and why?
We needed a custom init block when migrating InternalId issue records from project to namespace. The background migration now has been finalized several releases ago, so it should be safe to remove this as it's necessary for namespace level work items to work correctly
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #433127 (closed)
Edited by Mario Celi