Enable Feature in otlp http example

[cijothomas]

As of now, HTTP Exporter does not work without the experimental feature flag, so enabling it by default until this is fixed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.2%. Comparing base (e8a2878) to head (a4b5dde).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #2416     +/-   ##
=======================================
- Coverage   79.2%   79.2%   -0.1%     
=======================================
  Files        122     122             
  Lines      21539   21539             
=======================================
- Hits       17073   17069      -4     
- Misses      4466    4470      +4     

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