[chore] Refactor obsreport for scrapers to use new scraper.Metrics

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.16393% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@00fe41b). Learn more about missing BASE report.
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
receiver/scraperhelper/obs_metrics.go	93.18%	2 Missing and 1 partial ⚠️
receiver/scraperhelper/scrapercontroller.go	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11728   +/-   ##
=======================================
  Coverage        ?   91.61%           
=======================================
  Files           ?      442           
  Lines           ?    23764           
  Branches        ?        0           
=======================================
  Hits            ?    21772           
  Misses          ?     1620           
  Partials        ?      372           

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