feat: mark bofreqs as spam

[rjsparks]

This is an incremental improvement, allowing the bofreqs to be marked as spam. A future enhancement will gate bofreqs so spam bofreqs are never accepted in the first place.

Note that this does not delete the bofreq marked as spam - it only causes it to not appear on the bofreq listing (unless logged in as the secretariat where it will still show, but in a spam section). The spam-marked bofreq will still be available if its name is known.

cc: @cindymorgan

Fixes #7862

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.78%. Comparing base (c7f6bde) to head (45cf612).
Report is 50 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7869      +/-   ##
==========================================
- Coverage   88.78%   88.78%   -0.01%     
==========================================
  Files         296      303       +7     
  Lines       41320    41430     +110     
==========================================
+ Hits        36687    36784      +97     
- Misses       4633     4646      +13     

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