[receiver/k8scluster] Change k8s.replicaset metrics to use mdatagen

[povilasv]

Description: Change k8s.replicaset metrics to use mdatagen

The migration has the following side effects, we add scope and schema to metrics:

    schemaUrl: "https://opentelemetry.io/schemas/1.18.0"
...
        scope:
          name: otelcol/k8sclusterreceiver
          version: latest

Link to tracking Issue:
#10553
#4367

Testing:

• Updated unit tests

Documentation:

• Generated docs

[dmitryax]

@povilasv isn't this one ready?

[povilasv]

@povilasv isn't this one ready?

Not yet, I am investigating why E2E tests are failing https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/5542796872/jobs/10118157279?pr=24254

[povilasv]

Hey, @dmitryax and @crobert-1 this is ready for another round of review :)

Found the issue with CI.

FYI: The migration has the following side effects, we add scope and schema to metrics:

    schemaUrl: "https://opentelemetry.io/schemas/1.18.0"
...
        scope:
          name: otelcol/k8sclusterreceiver
          version: latest