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Automatic merge from submit-queue (batch tested with PRs 46407, 46457) GCE - Refactor API for firewall and backend service creation **What this PR does / why we need it**: - Currently, firewall creation function actually instantiates the firewall object; this is inconsistent with the rest of GCE api calls. The API normally gets passed in an existing object. - Necessary information for firewall creation, (`computeHostTags`,`nodeTags`,`networkURL`,`subnetworkURL`,`region`) were private to within the package. These now have public getters. - Consumers might need to know whether the cluster is running on a cross-project network. A new `OnXPN` func will make that information available. - Backend services for regions have been added. Global ones have been renamed to specify global. - NamedPort management of instance groups has been changed from an `AddPortsToInstanceGroup` func (and missing complementary `Remove...`) to a single, simple `SetNamedPortsOfInstanceGroup` - Addressed nitpick review comments of #45524 ILB needs the regional backend services and firewall refactor. The ingress controller needs the new `OnXPN` func to decide whether to create a firewall. **Release note**: ```release-note NONE ```