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Big Bang 4.0 bb-common subchart migration

Move package chart overrides for istio, networkPolicies, and routes under bb-common. For example, an umbrella override becomes:

packages:
  mattermostOperator:
    values:
      bb-common:
        networkPolicies:
          enabled: true
        istio:
          enabled: true

Direct Helm installations use the same bb-common block without the packages.mattermostOperator.values nesting. The subchart renders networking resources directly and validates its own values schema.

The umbrella no longer translates networkPolicies.controlPlaneCidr and networkPolicies.vpcCidr for this package. Configure networkPolicies.egress.definitions.kubeAPI explicitly, or use the package values.bb-common.networkPolicies.egress.definitions.kubeAPI override.

Replace istio.hardened configuration with supported bb-common.istio settings; the package no longer runs the legacy hardened-key migration.

Do not merge this migration until the final Big Bang 3.x release has shipped.