fix(@schematics/angular): reset module typeSeparator when generating applications

The application schematic now invokes the module schematic with `typeSeparator` explicitly set to `undefined`. This ensures any legacy value from `angular.json` set by older versions of the Angular CLI is cleared during application generation and does not cause multiple files to be generated.

Closes #30497

(cherry picked from commit 4be58ee)

Author: alan-agius4

packages/schematics/angular/application/index.ts

@@ -69,6 +69,7 @@ export default function (options: ApplicationOptions): Rule {
             routingScope: 'Root',
             path: sourceDir,
             project: options.name,
+            typeSeparator: undefined,
           }),
       schematic('component', {
         name: 'app',