Resolve "Add custom network policies"

General MR

Summary

Adding custom network policies at the values-level

Relevant logs/screenshots

Test override

grafana:
  enabled: true
  git:
    tag: null
    branch: "48-add-custom-network-policies"
  values:
    networkPolicies:
        enabled: true
        additionalPolicies:
        - name: this-is-a-grafana-job-test-test
          spec:
            podSelector: {}
            policyTypes:
            - Egress
            egress:
            - to:
              - ipBlock:
                  cidr: 172.20.0.0/12

Linked Issue

issue

Upgrade Notices

Adding custom network policies at the values-level using:

networkPolicies:
   additionalPolicies: []