add interval to entity events

[povilasv]

Component(s)

receiver/hostmetrics, receiver/k8scluster

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

add reporting interval to Entity Events as described in https://github.com/open-telemetry/oteps/blob/main/text/entities/0256-entities-data-model.md#entity-events

Describe the solution you'd like

reporting interval part of entity events being sent.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/hostmetrics: @dmitryax @braydonk

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[crobert-1]

Hello @povilasv, I see the PR for this issue, #34241, has been merged. Is there still more work to do here, or can we close this issue?