[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 86.07%. Comparing base (2f1385f) to head (5d149e9).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2734      +/-   ##
============================================
+ Coverage     79.47%   86.07%   +6.60%     
- Complexity      853      884      +31     
============================================
  Files           118      118              
  Lines          4999     4999              
  Branches        508      508              
============================================
+ Hits           3973     4303     +330     
+ Misses          883      536     -347     
- Partials        143      160      +17     

Flag	Coverage Δ
ingestion_beam	83.61% <ø> (+8.43%)	⬆️
ingestion_core	73.64% <ø> (ø)
ingestion_sink	84.07% <ø> (ø)

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