Remove WorkItemUpdateWidgets mutation from GraphQL API
What does this MR do and why?
WorkItemUpdateWidgets
was deprecated in favor of the workItemUpdate
mutation. We removed the last usage of the mutation by our frontend in !97427 (merged). Since this mutation was released as an alpha feature, we don't need to follow the regular major release deprecation process
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 #369154 (closed)