chore: add keywords to red-content search preset

[jennifer-richards]

Matches a change made to the live system. Keeping this draft until we've evaluated the change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.59%. Comparing base (8dbc1bc) to head (b97e2ab).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11159      +/-   ##
==========================================
+ Coverage   88.52%   88.59%   +0.06%     
==========================================
  Files         334      333       -1     
  Lines       45102    44669     -433     
==========================================
- Hits        39927    39573     -354     
+ Misses       5175     5096      -79     

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