[exporterhelper] Fix incorrect deduplication of exporter queue metrics

[dmitryax]

Fix incorrect deduplication of otelcol_exporter_queue_size and otelcol_exporter_queue_capacity metrics if multiple exporters are used.

Fixes #10444

The registered callbacks are ignored for now, which is the same behavior as before. Ideally, we would need to unregister them properly.

[codecov]

Codecov Report

Attention: Patch coverage is 89.65517% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.33%. Comparing base (b127da0) to head (77a0c9e).

Files	Patch %	Lines
...terhelper/internal/metadata/generated_telemetry.go	66.66%	2 Missing and 2 partials ⚠️
...ereceiver/internal/metadata/generated_telemetry.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10550      +/-   ##
==========================================
- Coverage   92.35%   92.33%   -0.03%     
==========================================
  Files         393      393              
  Lines       18622    18647      +25     
==========================================
+ Hits        17199    17218      +19     
- Misses       1066     1069       +3     
- Partials      357      360       +3     

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[codeboten]

Ideally, we would need to unregister them properly.

@dmitryax the telemetryBuilder could hold a list of registrations that it could use to unregister? did you want to open a follow up issue for this?

[dmitryax]

@dmitryax the telemetryBuilder could hold a list of registrations that it could use to unregister? did you want to open a follow up issue for this?

Yes, but this also can become unnecessary if open-telemetry/opentelemetry-go#5561 is fixed. I'll create an issue to track it