[receiver/awscontainerinsight] Filter terminated pods from node request metrics.

[jefchien]

Description: The node_<cpu|memory>_request metrics and metrics derived from them (node_<cpu|memory>_reserved_capacity) differ from the output of kubectl describe node <node_name>. This is because kubectl filters out terminated pods. See linked issue for more details.

Adds a filter for terminated (succeeded/failed state) pods.

Link to tracking Issue: #27262

Testing: Added unit test to validate pod state filtering. Built and deployed changes to cluster. Deployed cpu-test pod.

The gap is when the change was deployed. The metric drops after the deployment due to the filter. The metric can be seen spiking up while the cpu-test pod is running (~19:15) and then returns to the previous request size after it has terminated.

Documentation: N/A

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[Aneurysm9]

awscontainerinsightreceiver/internal/stores/podstore_test.go:632: File is not gofmt-ed with -s -r 'interface{} -> any' (gofmt)

Lint failure needs to be fixed.

[jefchien]

awscontainerinsightreceiver/internal/stores/podstore_test.go:632: File is not gofmt-ed with -s -r 'interface{} -> any' (gofmt)

Lint failure needs to be fixed.

Yep. The linting must've changed at some point. Will update it.

[jefchien]

The lint failure has been fixed.