Remove obsreportconfig package, reduce dependencies

[bogdandrutu]

Small issue that the SpanNameSep is duplicated, but is a very small duplicate.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.26%. Comparing base (168bba7) to head (3b2f460).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
processor/processorhelper/obsreport.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11148      +/-   ##
==========================================
- Coverage   92.28%   92.26%   -0.02%     
==========================================
  Files         414      414              
  Lines       19798    19802       +4     
==========================================
  Hits        18270    18270              
- Misses       1156     1160       +4     
  Partials      372      372              

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