Multiple invocations of `PodInterface.List` and `DeploymentInterface.List` methods throughout the codebase.

Calls to `PodInterface` and `DeploymentInterface`'s `List` method can be expensive for clusters with many resources. Skaffold makes this call multiple times in the course of a single devloop, some of them being:
- to get pods for syncing source changes
- to get pods to port-forward
- to get deployments of status-checking

We need to investigate other event driven approaches to avoid making these calls multiple times.