Add obs for logs in scraper/scraperhelper

[sincejune]

Description

This PR adds obs for logs in scraper/scraperhelper, also introduced new metrics for scraping logs.

Link to tracking issue

Relates to #11238

Testing

Added

Documentation

Added

[codecov]

Codecov Report

Attention: Patch coverage is 84.12698% with 10 lines in your changes missing coverage. Please review.

Project coverage is 91.65%. Comparing base (ced38e8) to head (b09005e).

Files with missing lines	Patch %	Lines
component/componenttest/otelchecker.go	0.00%	5 Missing ⚠️
scraper/scraperhelper/obs_logs.go	93.18%	2 Missing and 1 partial ⚠️
component/componenttest/obsreporttest.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12036      +/-   ##
==========================================
- Coverage   91.67%   91.65%   -0.02%     
==========================================
  Files         455      456       +1     
  Lines       24039    24102      +63     
==========================================
+ Hits        22038    22091      +53     
- Misses       1629     1638       +9     
- Partials      372      373       +1     

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[sincejune]

@bogdandrutu otelchecker.go and obsreporttest.go seem to be helper files for unit test, and have no test file covered. Are we able to skip tests for these two files?