perf: LogEnabled inline more

[cijothomas]

https://github.com/open-telemetry/opentelemetry-rust/pull/2823/files#r2001429329
Slight improvement actually. But at such low level, it is hard to measure.
Time to switch to measuring the number of instructions for more reliable numbers!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.7%. Comparing base (e43f3df) to head (cbe5834).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2828   +/-   ##
=====================================
  Coverage   79.7%   79.7%           
=====================================
  Files        124     124           
  Lines      23297   23297           
=====================================
  Hits       18582   18582           
  Misses      4715    4715           

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