Remove work_item_type fallback on Issue model
What does this MR do and why?
We can remove this fallback on the Issue model since we validated the NOT NULL constraint for work_item_type_id
in 15.7
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #361710 (closed)