[receiver/prometheus] Add support for `otel_scope_<attribute-name>` labels

[dmitryax]

In #41456 and #41488, we added support for otel_scope_name, otel_scope_version and otel_scope_schema_url.

The remaining part is support for labels containing OTel scope attributes in otel_scope_<attribute-name> form. That part is a bit more involved.

See open-telemetry/opentelemetry-go#5947 for how it's generated now.

[github-actions]

Pinging code owners:

• receiver/prometheus: @Aneurysm9 @dashpole @ArthurSens @krajorama

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

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• receiver/prometheusreceiver: @Aneurysm9 @dashpole @ArthurSens @krajorama

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