Use new query for issue board users autocomplete
What does this MR do and why?
Use the new user autocomplete GraphQL query so that it includes subgroup and descendant project members
This is similar to !129348 (merged) but for boards
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 #417757 (closed)
Edited by Heinrich Lee Yu