fix(api-logs)!: minimize noop logger exports

[dyladan]

Summary

• Replaces the exported NOOP_LOGGER constant and NoopLogger class with a single createNoopLogger(): Logger function, following the same pattern as the metrics API's createNoopMeter()
• The return type is narrowed to Logger to guarantee only the minimum required interface
• Updates sdk-logs LoggerProvider to use createNoopLogger() instead of NOOP_LOGGER
• Updates tests that relied on instanceof NoopLogger to use behavioral checks instead

Test plan

• api-logs tests pass
• sdk-logs tests pass

Fixes #6681

🤖 Generated with Claude Code

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dyladan / name: Daniel Dyla (6f3733b)

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.83%. Comparing base (67c1e89) to head (6ae2530).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
experimental/packages/api-logs/src/NoopLogger.ts	50.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (75.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6713      +/-   ##
==========================================
- Coverage   94.84%   94.83%   -0.01%     
==========================================
  Files         376      376              
  Lines       12702    12704       +2     
  Branches     2885     2885              
==========================================
+ Hits        12047    12048       +1     
- Misses        655      656       +1     

Files with missing lines	Coverage Δ
...perimental/packages/sdk-logs/src/LoggerProvider.ts	100.00% <100.00%> (ø)
experimental/packages/api-logs/src/NoopLogger.ts	85.71% <50.00%> (-14.29%)	⬇️

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[trentm]

nit: Put ! for breaking in the PR title?

[dyladan]

nit: Put ! for breaking in the PR title?

done