[FIX] Remove datasetIDs from metricsRequest object

[etaques]

This PR removes datasetIDs from metricsRequest (otel) attributes, to be sent to prometheus without dataset_ids attribute on metrics

Metrics attributes before change:

Metrics attributes after change:

[codecov-commenter]

Codecov Report

Base: 60.68% // Head: 60.48% // Decreases project coverage by -0.19% ⚠️

Coverage data is based on head (a9b86ec) compared to base (732b9b3).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2013      +/-   ##
===========================================
- Coverage    60.68%   60.48%   -0.20%     
===========================================
  Files           70       70              
  Lines         4891     4907      +16     
===========================================
  Hits          2968     2968              
- Misses        1923     1939      +16     

Impacted Files	Coverage Δ
sinker/otel/orbreceiver/otlp.go	0.00% <0.00%> (ø)

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[lpegoraro]

LGTM