[receiver/lightprometheus] Change configurable resource_attribute names

[crobert-1]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.89%. Comparing base (d3fc24b) to head (02562b2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6257      +/-   ##
==========================================
+ Coverage   44.84%   44.89%   +0.04%     
==========================================
  Files         390      390              
  Lines       26983    27006      +23     
==========================================
+ Hits        12100    12123      +23     
  Misses      14013    14013              
  Partials      870      870              

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