[PoC] Add Sink test for labeled_labeled_counter metric

[akkomar]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.23%. Comparing base (9c65dd1) to head (8ed8722).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2734   +/-   ##
=========================================
  Coverage     85.23%   85.23%           
  Complexity      950      950           
=========================================
  Files           125      125           
  Lines          5372     5372           
  Branches        545      545           
=========================================
  Hits           4579     4579           
  Misses          612      612           
  Partials        181      181           

Flag	Coverage Δ
ingestion_beam	82.78% <ø> (ø)
ingestion_core	73.64% <ø> (ø)
ingestion_sink	84.07% <ø> (ø)

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