[chore] newObsReport is no longer needed

[codeboten]

This is leftover from the refactor to make that func private to the package. Removing it as all the callers can use newExporter directly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.88%. Comparing base (b10029c) to head (271b880).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10957      +/-   ##
==========================================
- Coverage   91.89%   91.88%   -0.01%     
==========================================
  Files         411      411              
  Lines       19311    19309       -2     
==========================================
- Hits        17745    17743       -2     
  Misses       1217     1217              
  Partials      349      349              

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