backend/tracing: add fields to span again for error spantrace

[vnghia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.27027% with 11 lines in your changes missing coverage. Please review.

Project coverage is 74.04%. Comparing base (04c753c) to head (7baef23).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
nghe-backend/src/filesystem/path/serde.rs	0.00%	9 Missing ⚠️
nghe-backend/src/filesystem/local.rs	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #567      +/-   ##
==========================================
+ Coverage   73.01%   74.04%   +1.02%     
==========================================
  Files         184      174      -10     
  Lines        4718     4643      -75     
  Branches     4718     4643      -75     
==========================================
- Hits         3445     3438       -7     
+ Misses        840      783      -57     
+ Partials      433      422      -11     

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