Istio Operator Removal SKIP UPGRADE DEBUG

Package Merge Request

Package Changes

• Removes the Istio Operator package
• Removes the Istio Controlplane package
• Refactors the Istio Hardened work into a new top-level value for BB: .Values.networkHardening
• Updates BB documentation to support the above changes

Package MR

N/A

For Issue

Closes #2584 (closed)

Upgrade Notices

• Migrate to Operatorless Istio in BB 2.54 prior to upgrading clusters to BB 3.0
• See: https://docs-bigbang.dso.mil/latest/docs/guides/using-bigbang/migrating-istio-for-bb3.0