[admin] Remove previews for non-UI components that didn't add much value

[elia]

Summary

The coverage shouldn't drop after this change.

Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (64f6a58) 88.66% compared to head (d4c83e3) 88.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5592      +/-   ##
==========================================
- Coverage   88.66%   88.65%   -0.01%     
==========================================
  Files         683      683              
  Lines       16293    16293              
==========================================
- Hits        14446    14445       -1     
- Misses       1847     1848       +1     

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