[connectors/spanmetrics] Drop Prometheus-specific metrics labels sanitization.

[kovrus]

Component(s)

connector/spanmetrics

Describe the issue you're reporting

Description

Remove Prometheus-specific labels sanitization.

The spanmeterics connector is the OTel component, therefore, we would like to strip Prometheus-specific parts from it. The label conversion to Prometheus conventions should happen in the Prometheus component, e.g. Prometheus remote write exporter (which is implemented already).

It is the change that will be done in the new (not yet enabled) component, so it does not break anything for the existing users. However, we have to inform users about these changes when migrating from spanmeterics processor to spanmeterics connector.

[github-actions]

Pinging code owners:

• connector/spanmetrics: @albertteoh

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

Pinging code owners for connector/spanmetrics: @albertteoh. See Adding Labels via Comments if you do not have permissions to add labels yourself.