user invites: backend: collaborators found for only 12% of users

Created by: slimsag

Metrics show that of users who navigate to the "start searching" screen, only 12% do we actually find any collaborators they could invite.

Improvements I am implementing to improve this number:

• #31278 (closed)
• #31279 (closed)
• #31280 (closed)
• #31444 (closed)
• #31446 (closed)