otelconf: add support for propagator configuration

[codeboten]

Fixes #6712

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (030a91a) to head (38e5cbc).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #8281     +/-   ##
=======================================
- Coverage   82.3%   82.2%   -0.1%     
=======================================
  Files        193     194      +1     
  Lines      13769   13801     +32     
=======================================
+ Hits       11334   11355     +21     
- Misses      2030    2041     +11     
  Partials     405     405             

Files with missing lines	Coverage Δ
otelconf/config.go	97.8% <100.0%> (+0.1%)	⬆️
otelconf/propagator.go	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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