Enable batching for traces

[marctc]

This PR re-enables support for batching in traces. It uses the experimental API for batching introduced recently
This is the issue to track the progress: open-telemetry/opentelemetry-collector#8122

[codecov]

Codecov Report

Attention: Patch coverage is 70.58824% with 10 lines in your changes missing coverage. Please review.

Project coverage is 80.76%. Comparing base (5998c47) to head (4f59fa7).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/export/otel/traces.go	70.58%	7 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1352      +/-   ##
==========================================
+ Coverage   72.09%   80.76%   +8.66%     
==========================================
  Files         144      145       +1     
  Lines       14586    14653      +67     
==========================================
+ Hits        10516    11834    +1318     
+ Misses       3373     2236    -1137     
+ Partials      697      583     -114     

Flag	Coverage Δ
integration-test	58.90% <70.58%> (-0.11%)	⬇️
k8s-integration-test	59.30% <52.94%> (-0.01%)	⬇️
oats-test	34.41% <47.05%> (+0.01%)	⬆️
unittests	52.01% <47.05%> (?)

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[mariomac]

LGTM!