Add Multiingress Gateway Support to Big Bang

Package Owner Merge Request

Package Changes

What package changes are included with this merge request? The more detail here the better!

Releases

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/releases/1.8.4-bb.6

Merge Requests

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/48

Additional Details

Adds Big Bang support for Multiple Ingress Gateways. See docs/guides/multiple_ingress.md for details.

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/452