OTLPExporter - change to http as default feature flag

[cijothomas]

Fixes #1757

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.9%. Comparing base (f46bccc) to head (3106011).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2516   +/-   ##
=====================================
  Coverage   77.9%   77.9%           
=====================================
  Files        123     123           
  Lines      22953   22953           
=====================================
  Hits       17881   17881           
  Misses      5072    5072           

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