fix: rich text editor v2 [WPB-12089]

[olafsulich]

WPB-12089 [Web] Text formatting via UI in text input field

Description

Continuation of #18520

What's changed?

• fix mentions (before it was breaking with the | character and multiple same mentions next to each other)
• remove unnecessary line spacing (white-space: pre-wrap;)
• fix edit message view (rich text turned off)

Checklist

• mentions the JIRA issue in the PR name (Ex. [WPB-XXXX])
• PR has been self reviewed by the author;
• Hard-to-understand areas of the code have been commented;
• If it is a core feature, unit tests have been added;

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 46.15%. Comparing base (aec9c85) to head (336007b).
Report is 8 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #18528   +/-   ##
=======================================
  Coverage   46.15%   46.15%           
=======================================
  Files         865      865           
  Lines       26654    26654           
  Branches     6033     6033           
=======================================
  Hits        12303    12303           
  Misses      12812    12812           
  Partials     1539     1539           

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud