Fix rollouts:create to handle backend regionality & other fixes (#7862)

* lookup backends in other regions

* fix bug bash bugs

* add src/apphosting/index.ts back in

* switch to v1beta from v1alpha

Author: blidd-google

CHANGELOG.md

@@ -1 +1,2 @@
+- Fix rollouts:create to handle backend regionality & other fixes. (#7862)
 - Fixed Next.js issue with PPR routes not rendering correctly. (#7625)

src/apphosting/index.spec.ts renamed to src/apphosting/backend.spec.ts

@@ -13,7 +13,7 @@ import {
   setDefaultTrafficPolicy,
   ensureAppHostingComputeServiceAccount,
   getBackendForAmbiguousLocation,
-} from "./index";
+} from "./backend";
 import * as deploymentTool from "../deploymentTool";
 import { FirebaseError } from "../error";