Make changes to existing query for fetching permission and add another relationship type
Update `related work items query`to include `userPermissions.adminMergeRequest` so the frontend can conditionally show the `+` add and `×` remove affordances. Also extend the query to support the new `workItemRelations` field (with `linkType` and `fromMrDescription`) alongside the existing `linkedWorkItems` field, gated behind the `explicit_mr_work_item_relations` feature flag.
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