fix(@schematics/angular): validate project name before prompts

When an invalid project name is given, throw an error before going through prompts.

Closes #14994

(cherry picked from commit a8c63a7)

packages/schematics/angular/ng-new/index.ts

@@ -24,6 +24,7 @@ import {
   RepositoryInitializerTask,
 } from '@angular-devkit/schematics/tasks';
 import { Schema as ApplicationOptions } from '../application/schema';
+import { validateProjectName } from '../utility/validation';
 import { Schema as WorkspaceOptions } from '../workspace/schema';
 import { Schema as NgNewOptions } from './schema';
 
@@ -33,6 +34,8 @@ export default function(options: NgNewOptions): Rule {
     throw new SchematicsException(`Invalid options, "name" is required.`);
   }
 
+  validateProjectName(options.name);
+
   if (!options.directory) {
     options.directory = options.name;
   }