Pagination limits autocomplete results for group links

Overview

Failure to autocomplete more then 20 items on /namespace/projects/group_links group dropdown.

Reproduce

1. Create 21 groups with a common name
   • AA, AA1, AA2, AA3, AA4, AA5, AA6 to AA21
2. Visit /namespace/projects/group_links
3. Type in a group to autocomplete AA
   • A request to groups/autocomplete?search=AA&per_page=20 will be sent
4. The group AA will not be included in the results due to per_page value of 20 and desc results.

Actual

The group AA is not returned.

Expected

Return all groups matching AA

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https://gitlab.zendesk.com/agent/tickets/30512