Fix invitation deep link handling

This MR fixes the following issue: [Invite friends] Tapping on a UD link does search automatically but nothing is found/no results -> forever searching.

What was done

• Fix starting search when invitation deep link is handled.
• Perform search (including waiting for node registration ratio) using a background scheduler, so the main queue is not blocked.

Simulator_Screen_Recording_-iPhone_14_Pro-_2022-12-13_at_13.59.52