[opentelemetry-collector] add entity interval for k8sobjects

[povilasv]

Fix: https://coralogix.atlassian.net/browse/ES-413

Tested locally in kind cluster and CX as logs backend

observedTimeUnixNano:1736329868546249700
attributes:{
k8s_resource_name:pods
otel_entity_interval:3600000
}
resource:{
attributes:{
k8s_namespace_name:default
}
}
status:{