feat(safety): added NoFileDescriptorLeak (linux)

[fredbi]

This is a linux-only assertion to guard against file descritor leaks.

Unlike goroutine leak checks, this one does not support parallel tests.

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 82.85714% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.31%. Comparing base (ca0f3dc) to head (5edd217).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/fdleak/fdleak.go	80.76%	5 Missing and 5 partials ⚠️
internal/assertions/safety.go	69.23%	2 Missing and 2 partials ⚠️
require/require_forward.go	83.33%	2 Missing ⚠️
require/require_assertions.go	83.33%	1 Missing ⚠️
require/require_format.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   91.40%   91.31%   -0.09%     
==========================================
  Files          90       91       +1     
  Lines       11784    11889     +105     
==========================================
+ Hits        10771    10857      +86     
- Misses        807      819      +12     
- Partials      206      213       +7     

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