believening

Results 12 issues of believening

**Please provide a description of this PR:** try impl mcp-over-xds for delta-adsc as: - https://github.com/istio/istio/pull/48031#issuecomment-1882263184 - https://github.com/istio/istio/pull/48031/files#r1525694938

area/networking
ok-to-test
size/XL
release-notes-none

https://github.com/istio/istio/blob/e3386b498afee33d7362c061135de6084881e2b8/pilot/pkg/serviceregistry/kube/controller/ambient/ambientindex.go#L360-L369 maybe: ``` diff @@ -359,6 +359,7 @@ func (a *index) All() []model.AddressInfo { res[overwrite] = workloadToAddressInfo(wl.Workload) } else if write { res = append(res, workloadToAddressInfo(wl.Workload)) + overwrite = len(res)...