Add internal-logs feature to opentelemetry-proto

[utpilla]

CI checks are failing due to internal-logs not being a feature defined for opentelemetry-proto: https://github.com/open-telemetry/opentelemetry-rust/actions/runs/12745545110/job/35519725802?pr=2494

Changes

• Add internal-logs feature to opentelemetry-proto

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.9%. Comparing base (6cc327d) to head (eeb9f14).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2507   +/-   ##
=====================================
  Coverage   77.9%   77.9%           
=====================================
  Files        123     123           
  Lines      22887   22881    -6     
=====================================
  Hits       17838   17838           
+ Misses      5049    5043    -6     

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