controllers/krate/search: Remove obsolete AsyncConnectionWrapper

[Turbo87]

forgot this in #10021... 🙈

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.23%. Comparing base (b01b5e1) to head (bdb546d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10034   +/-   ##
=======================================
  Coverage   89.22%   89.23%           
=======================================
  Files         295      295           
  Lines       30839    30836    -3     
=======================================
- Hits        27517    27515    -2     
+ Misses       3322     3321    -1     

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