fix(code): don't wrap lines in code blocks, only in plaintext documents

[mejo-]

We want line wrapping in code blocks in plaintext txt documents only.

Fixes: #7601

🖼️ Screenshots

🏚️ Before	🏡 After

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.34%. Comparing base (59ad9f2) to head (5a4a5fc).
⚠️ Report is 23 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7733   +/-   ##
=======================================
  Coverage   59.34%   59.34%           
=======================================
  Files         503      503           
  Lines       39210    39210           
  Branches     1142     1142           
=======================================
  Hits        23268    23268           
  Misses      15834    15834           
  Partials      108      108           

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[mejo-]

/backport to stable32

[mejo-]

/backport to stable31