Remove WorkItemDeleteTask mutation from GraphQL API
What does this MR do and why?
Small cleanup of a mutation. The mutation was introduced as alpha so no need to follow the deprecation process. The frontend no longer uses the field as confirmed by the frontend team in #434863 (comment 1690524825)
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #435040 (closed)