Shared AuthPol monitoring-authz is no longer needed

Summary

The Monitoring Authz AuthorizationPolicy has been added within the Monitoring package, and will be integrated any time that it is used. This makes its creation here redundant and it should have been removed when i did my first path of AuthPol changes.

Steps to reproduce

When deploying bigbang using istio.hardened = True, along with Monitoring and Mattermost, this policy will try to create the same resource at the same time as https://repo1.dso.mil/big-bang/product/packages/monitoring/-/blob/main/chart/templates/bigbang/istio/authorizationPolicies/shared-monitoring-authz-policy.yaml?ref_type=heads

What is the expected behavior?

This resource only needs to be deployed once and it is most logical for it to be within the Monitoring chart

Relevant logs and/or screenshots

Possible fixes

Just remove from here and test a bigbang deployment using both monitoring and mattermost to ensure AuthPols work as expected