Istio: Add support for Egress Gateways

Package Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/blob/1.13.5-bb.2/CHANGELOG.md

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/116

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/issues/22