Summary:
Switches over from poll to push just like the node watcher.
Note that status aggregation currently causes a fetch on the vizier CRD. There's
room for improvment in the design there.

Test Plan: Existing tests + skaffold vizier

Reviewers: michelle, philkuz

Reviewed By: philkuz

Differential Revision: https://phab.corp.pixielabs.ai/D9695

GitOrigin-RevId: 046018a63a5a2011c2d9459667e138a94a56fc72