fix(errors): extend error status code supported by ggshield

[salome-voltz]

Context

Some error code return by the API are not detected as such by ggshield. As a result, the UI displays "No secret have been found", while the scan failed and the files were not processed. This is misleading.

Examples:

What has been done

• Extend handle_api_error case list to handle "Source not found" error, and 5xx errors
• Fix a bug in handle_scan_chunk_error to display the correct error when the source is not found

Validation

• Run ggshield secret scan path --source-uuid b84b3f32-08df-448e-b49f-11186b003e73 <path> (fake UUID) and ensure the UI displays the expected result. Especially, "No secret have been found" should not be displayed:

PR check list

• As much as possible, the changes include tests (unit and/or functional)
• If the changes affect the end user (new feature, behavior change, bug fix) then the PR has a changelog entry (see doc/dev/getting-started.md). If the changes do not affect the end user, then the skip-changelog label has been added to the PR.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.95%. Comparing base (ef7aa67) to head (07b3633).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ggshield/core/errors.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1126      +/-   ##
==========================================
- Coverage   91.99%   91.95%   -0.05%     
==========================================
  Files         144      144              
  Lines        6162     6166       +4     
==========================================
+ Hits         5669     5670       +1     
- Misses        493      496       +3     

Flag	Coverage Δ
unittests	91.95% <80.00%> (-0.05%)	⬇️

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