Summary:
We have seen multiple reports of our operator monitoring failing on
the k8s watcher and restarting the watcher also fails since the RV is too old.

On further investigation, it seems like we should be using informers to handle
resource watching, so switch to informers

Test Plan: skaffold deploy the operator with some additional logging

Reviewers: michelle, philkuz

Reviewed By: philkuz

JIRA Issues: PP-3066
Signed-off-by: Vihang Mehta <vihang@pixielabs.ai>

Differential Revision: https://phab.corp.pixielabs.ai/D9899

GitOrigin-RevId: 1f776f63db89e527d45d688d2d7d9be2b9a0eae0