prefer_markdown option in chat

[vangheem]

Description

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How was this PR tested?

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.80%. Comparing base (3467cd8) to head (5e7963a). Report is 5 commits behind head on main.

:exclamation: Current head 5e7963a differs from pull request most recent head 64309db. Consider uploading reports for the commit 64309db to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2098      +/-   ##
==========================================
- Coverage   74.97%   74.80%   -0.18%     
==========================================
  Files          80       80              
  Lines        5894     5945      +51     
==========================================
+ Hits         4419     4447      +28     
- Misses       1475     1498      +23     

Flag	Coverage Δ
utils	81.70% <ø> (ø)

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