[otap-dataflow] propagate headers in otlp exporter

[c1ly]

Change Summary

Updated the otlp exporter to check if there is a propagation policy and if the received OtapPdata contains any headers in the context, if yes then exporter will apply the policy to the headers and create a tonic MetadataMap containing the propagated headers. Update the exporter to insert the MetadataMap in the grpc request

What issue does this PR close?

• Closes Propagate headers in the OTLP Exporter #2563

How are these changes tested?

unit tests

Are there any user-facing changes?

no

[codecov]

Codecov Report

❌ Patch coverage is 94.32990% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.37%. Comparing base (beb4fa2) to head (65d9249).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2585    +/-   ##
========================================
  Coverage   88.37%   88.37%            
========================================
  Files         620      620            
  Lines      228395   228577   +182     
========================================
+ Hits       201850   202011   +161     
- Misses      26021    26042    +21     
  Partials      524      524            

Components	Coverage Δ
otap-dataflow	90.21% <94.32%> (-0.01%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	90.74% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	52.45% <ø> (ø)
quiver	92.27% <ø> (ø)

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[lquerel]

@albertlockett could you take a look at this one also :-)

[lquerel]

LGTM

[albertlockett]

@albertlockett could you take a look at this one also :-)

sorry for the late reply @lquerel ! I did look at this yesterday, thought I had approved but I guess I forgot to click the button 🤦‍♂️

[lquerel]

@albertlockett could you take a look at this one also :-)

sorry for the late reply @lquerel ! I did look at this yesterday, thought I had approved but I guess I forgot to click the button 🤦‍♂️

Thank you again for all the reviews you did yesterday!