fix(errors): fix error wrapping

[fredbi]

We add a check before wrapping errors, preventing the package-level sentinel error to be added multiple times, and show untidy duplicate error messages.

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.82%. Comparing base (8538331) to head (70cb1da).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
spec.go	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   83.61%   83.82%   +0.21%     
==========================================
  Files           5        5              
  Lines         299      303       +4     
==========================================
+ Hits          250      254       +4     
  Misses         31       31              
  Partials       18       18              

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