webrtc: return detailed errors in responses

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #2594 (957df1a) into main (f11f39f) will increase coverage by 0.11%.
Report is 1 commits behind head on main.
The diff coverage is 30.00%.

@@            Coverage Diff             @@
##             main    #2594      +/-   ##
==========================================
+ Coverage   59.87%   59.98%   +0.11%     
==========================================
  Files         145      145              
  Lines       15525    15537      +12     
==========================================
+ Hits         9295     9320      +25     
+ Misses       5588     5574      -14     
- Partials      642      643       +1     

Files	Coverage Δ
internal/core/webrtc_manager.go	64.03% <0.00%> (-0.30%)	⬇️
internal/core/webrtc_session.go	62.84% <14.28%> (-0.59%)	⬇️
internal/core/webrtc_http_server.go	69.45% <42.10%> (+10.30%)	⬆️

... and 1 file with indirect coverage changes

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