fix: remove primary color from discussion post and messages text

[bydawen]

Description

There is an issue where on discussion pages, comment text and username have text-primary-500 class which is usually used for links, buttons, etc. instead of general text colors of the platform:

It's looks strange and not consistent with other platform styles, and can also confuse users by making it appear as if they are clickable elements.

Testing Instructions

1. Open course
2. Go to the Discussion tab
3. Choose some post and look on it's text
4. It will look like general text with corresponding color

After the fix:

Changelog

• Removed wrong text color classes

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.56%. Comparing base (4d51cf8) to head (905d58e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #793      +/-   ##
==========================================
+ Coverage   94.49%   94.56%   +0.06%     
==========================================
  Files         164      164              
  Lines        3618     3622       +4     
  Branches      993      991       -2     
==========================================
+ Hits         3419     3425       +6     
+ Misses        185      183       -2     
  Partials       14       14              

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Sandbox deployment successful 🚀
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