[chore] Move exporter/internal to exporterhelper/internal when possible

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.55%. Comparing base (6aad9d1) to head (deffccd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
exporter/exporterhelper/internal/experr/err.go	77.77%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (77.77%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12683   +/-   ##
=======================================
  Coverage   91.55%   91.55%           
=======================================
  Files         480      481    +1     
  Lines       26391    26391           
=======================================
  Hits        24162    24162           
  Misses       1766     1766           
  Partials      463      463           

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