Remove some dead code and add tests on RetrySendMessageMenu

[bmarty]

Also do some renaming for code clarity.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 73.45%. Comparing base (476a54c) to head (20ebb5e).

Files	Patch %	Lines
...e/components/retrysendmenu/RetrySendMessageMenu.kt	71.42%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2659      +/-   ##
===========================================
+ Coverage    73.37%   73.45%   +0.07%     
===========================================
  Files         1458     1455       -3     
  Lines        35168    35105      -63     
  Branches      6750     6733      -17     
===========================================
- Hits         25805    25786      -19     
+ Misses        5850     5804      -46     
- Partials      3513     3515       +2     

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[jmartinesp]

LGTM, thanks!