[receiver/k8scluster] Add container image cryptographic digest attribute (container.image.id)

[rogercoll]

Component(s)

receiver/k8scluster

Is your feature request related to a problem? Please describe.

If a container that is being instrumented using the k8scluster receiver has been deployed using a container image that contains a cryptographic digest, the receiver does not produce any attribute related to that digest.

Describe the solution you'd like

Populate the container.image.id resource attribute when an image ID contains a digest.

Describe alternatives you've considered

No response

Additional context

Correctly parsing the image takes precedence: https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/36279

[github-actions[bot]]

Pinging code owners:

• receiver/k8scluster: @dmitryax @TylerHelmuth @povilasv

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