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

[povilasv]

Description:

Change k8s.daemonset 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

[povilasv]

Hey, @dmitryax and @crobert-1 this is ready for review.

Unit tests failures are unrelated , (datadogexporter)

ok  	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/hostmetadata/internal/system	0.037s	coverage: 67.9% of statements
==================
WARNING: DATA RACE
Read at 0x00c00011a863 by goroutine 19:
 ...
FAIL

[povilasv]

@dmitryax updated :)