Merge branch '417757-group-autocomplete-graphql' into 'master'

Add group users autocomplete to GrahQL API

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/128306



Merged-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Marcos Rocha <mrocha@gitlab.com>
Co-authored-by: Heinrich Lee Yu <heinrich@gitlab.com>