Rely on the SDK to decide if a caption is editable or not

[bmarty]

Need matrix-org/matrix-rust-sdk#4303 to work but not to compile.

Complement for #3902, let read the value from the SDK instead of computing it again in the application code.

Note: the Rust PR has been merged but we will need a SDK release to have the new behavior. Merging this PR before will temporarily disable edition of caption.

[github-actions]

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[sonarcloud]

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.95%. Comparing base (e8af711) to head (560a04c).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3917      +/-   ##
===========================================
- Coverage    82.95%   82.95%   -0.01%     
===========================================
  Files         1786     1786              
  Lines        45224    45222       -2     
  Branches      5338     5336       -2     
===========================================
- Hits         37517    37515       -2     
  Misses        5836     5836              
  Partials      1871     1871              

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