add shared authz policy

General MR

Summary

Adds back shared authz to allow authservice enabled pods to be scraped, and for alertmanager to function.

Relevant logs/screenshots

Deployed with (plus dev-sso):

monitoring:
  enabled: true
  sso:
    enabled: true

istiod:
  enabled: true
  values:
    hardened:
      enabled: false

Metrics Working

These are the only AuthorizationPolicies in the cluster:

Alertmanager istio-proxy logs allowing prometheus POST and metrics scrape

Linked Issue

issue

Upgrade Notices

N/A