Add accepted/refused/failed profile sample metrics to the receivers

[dmathieu]

This adds obs metrics to the profiles receivers.

[codspeed-hq]

CodSpeed Performance Report

Merging #14226 will not alter performance

_{Comparing dmathieu:receiverhelper-profiles-metrics (07f6ced) with main (73f090c)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 71 untouched

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.13%. Comparing base (73f090c) to head (07f6ced).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14226      +/-   ##
==========================================
+ Coverage   92.10%   92.13%   +0.02%     
==========================================
  Files         667      667              
  Lines       41453    41525      +72     
==========================================
+ Hits        38181    38258      +77     
+ Misses       2227     2224       -3     
+ Partials     1045     1043       -2     

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[rogercoll]

small nit