Spec compliance: OTEL_PROPAGATORS should still work when OTEL_SDK_DISABLED

[mikeblum]

…ABLED=false

[trask]

can you see if you can add a test for this?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (cb64451) to head (198625e).

❌ Your project check has failed because the head coverage (89.97%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7062      +/-   ##
============================================
+ Coverage     89.84%   89.85%   +0.01%     
- Complexity     6610     6613       +3     
============================================
  Files           740      740              
  Lines         19981    19983       +2     
  Branches       1966     1966              
============================================
+ Hits          17951    17956       +5     
+ Misses         1440     1436       -4     
- Partials        590      591       +1     

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