Disable warning message when using traceIdSampler as root

[andrzejressel]

Closes #8064

I believe this warning was added incorrectly during refactoring: https://github.com/open-telemetry/opentelemetry-java/pull/7948/changes#diff-f5b51b22d75fd6b9122f6e30138f8688a744a5d168088e0f5ddb7fa4579a2f7cR23

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.22%. Comparing base (857cd7b) to head (e2eff38).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8065      +/-   ##
============================================
- Coverage     90.23%   90.22%   -0.01%     
+ Complexity     7602     7601       -1     
============================================
  Files           838      838              
  Lines         22806    22805       -1     
  Branches       2274     2274              
============================================
- Hits          20578    20575       -3     
- Misses         1518     1519       +1     
- Partials        710      711       +1     

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[jack-berg]

Thanks!

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