Remove logs_level_enabled feature flag

[lalitb]

Fixes #1697

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 71.3%. Comparing base (e2e6a6e) to head (2c8e5c1).

❗ Current head 2c8e5c1 differs from pull request most recent head 9d80cb9

Please upload reports for the commit 9d80cb9 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1736     +/-   ##
=======================================
- Coverage   74.4%   71.3%   -3.1%     
=======================================
  Files        122     136     +14     
  Lines      19767   20836   +1069     
=======================================
+ Hits       14723   14876    +153     
- Misses      5044    5960    +916     

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[lalitb]

Reopening this PR as specs is updated now - open-telemetry/opentelemetry-specification#4020

[cijothomas]

Reopening this PR as specs is updated now - open-telemetry/opentelemetry-specification#4020

It is still experimental, so maybe wait till it gets stable.

[lalitb]

closing again, as feature is still experimental