Create Istio authorization policies and Service Entry for mimir

1. Create Authorization policies:
2. Access to Minio from mimir
3. Alloy to mimir
4. prometheus to mimir
5. grafana to mimir
6. Access to AWS S3? (service entry - see Thanos customServiceEntry for aws egress- https://repo1.dso.mil/big-bang/bigbang/-/blob/master/chart/templates/thanos/values.yaml?ref_type=heads#L27 that populates https://repo1.dso.mil/big-bang/product/packages/thanos/-/blob/main/chart/templates/bigbang/serviceEntry.yaml#L6 )