Fix room list cell highlighting issues, add unit tests

[stefanceriu]

Fixes the problem reported by Benoit here

• highlights badges when the room is marked as unread but muted
• adds unit tests to prevent us from breaking this rather complex logic

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

	Warnings
⚠️	Please add a changelog.
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 33ed8ef

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c320152) 72.90% compared to head (33ed8ef) 72.89%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2432      +/-   ##
===========================================
- Coverage    72.90%   72.89%   -0.01%     
===========================================
  Files          523      523              
  Lines        36244    36241       -3     
  Branches     17423    17422       -1     
===========================================
- Hits         26422    26419       -3     
- Misses        9180     9181       +1     
+ Partials       642      641       -1     

Flag	Coverage Δ
unittests	58.27% <100.00%> (-0.04%)	⬇️

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[Velin92]

LGTM