metrics-agent-2.12.0 - Payload Reduction & Memory Optimization

This release includes memory optimization of the metrics-agent by stripping unused metadata from Kubernetes resources in the informers.

This should reduce the metrics-agent's memory footprint and reduce the upload payload.

Also included in this release is the dropping of resources that do not incur costs. Examples being replica sets with zero active pods and jobs that have been completed over an hour ago. Thanks @jdhudson3 for the efforts here!