Exclude bin/ directory from code coverage

[kraftbj]

Summary

• Excludes the bin/ directory from Codecov coverage calculations

The bin/ directory contains CLI and infrastructure scripts that make HTTP requests to external APIs (GitHub REST/GraphQL). These are integration scripts that are inherently difficult to unit test without extensive HTTP mocking.

See #354 as an example - the codecov/patch check passes (confirming the testable parsing logic has coverage), but codecov/project fails because the CLI orchestration code in bin/ isn't covered.

Test plan

• Verify Codecov no longer counts bin/ files toward project coverage

[github-actions]

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Props kraftbj, bernhard-reiter.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.73%. Comparing base (7756c10) to head (208e54f).

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk     #355      +/-   ##
============================================
- Coverage     53.67%   49.73%   -3.94%     
  Complexity     4410     4410              
============================================
  Files           298      298              
  Lines         39424    39424              
============================================
- Hits          21161    19609    -1552     
- Misses        18263    19815    +1552     

Flag	Coverage Δ
e2e-js	45.02% <ø> (-0.06%)	⬇️
e2e-php	35.80% <ø> (-6.64%)	⬇️
javascript	15.07% <ø> (ø)
phpunit	29.97% <ø> (ø)

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[ockham]

See #354 as an example - the codecov/patch check passes (confirming the testable parsing logic has coverage), but codecov/project fails because the CLI orchestration code in bin/ isn't covered.

Seems to be passing now though for that PR?

[kraftbj]

Yeah, the last commit apparently changed the coverage so it wouldn't fail. Here's an example of the run where it did fail https://github.com/WordPress/secure-custom-fields/runs/60370170867

I'm not exactly sure why it differed so much between those two commits.