[exporterhelper] Move experimental symbols to xexporterhelper

[mx-psi]

Description

Moves all symbols marked as 'Experimental' to xexporterhelper.

Link to tracking issue

Updates #11143

[codecov]

Codecov Report

❌ Patch coverage is 75.93985% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.38%. Comparing base (2e9dda5) to head (f005db9).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
exporter/exporterhelper/internal/new_request.go	79.31%	12 Missing and 6 partials ⚠️
...rter/exporterhelper/xexporterhelper/new_request.go	0.00%	8 Missing ⚠️
...r/exporterhelper/xexporterhelper/profiles_batch.go	40.00%	3 Missing ⚠️
exporter/exporterhelper/logs.go	87.50%	1 Missing ⚠️
exporter/exporterhelper/metrics.go	87.50%	1 Missing ⚠️
exporter/exporterhelper/traces.go	87.50%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (75.93%) 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   #13821      +/-   ##
==========================================
- Coverage   91.42%   91.38%   -0.04%     
==========================================
  Files         646      648       +2     
  Lines       42606    42620      +14     
==========================================
- Hits        38952    38949       -3     
- Misses       2833     2849      +16     
- Partials      821      822       +1     

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[mx-psi]

I will wait a couple more days before merging in case @dmitryax or @bogdandrutu want to review since they are the code owners of this part of the code

[dmitryax]

Thank you, @mx-psi

[mx-psi]

I forgot to move three symbols marked as experimental, I have moved them in #13868