Add group users autocomplete to GrahQL API
What does this MR do and why?
Adds a GraphQL field for searching group users for autocomplete.
This is similar to !125148 (merged) but for groups.
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