fix(@schematics/angular): update default app component welcome message

Aligns the inline welcome message with the external template for consistency.

Closes #32176

Author: alan-agius4

packages/schematics/angular/application/files/module-files/src/app/app__suffix__.ts.template

@@ -3,7 +3,7 @@ import { Component, signal } from '@angular/core';
 @Component({
   selector: '<%= selector %>',<% if(inlineTemplate) { %>
   template: `
-    <h1>Welcome to {{ title() }}!</h1>
+    <h1>Hello, {{ title() }}</h1>
 
     <% if (routing) {
      %><router-outlet /><%

packages/schematics/angular/application/files/standalone-files/src/app/app__suffix__.ts.template

@@ -5,7 +5,7 @@ import { RouterOutlet } from '@angular/router';<% } %>
   selector: '<%= selector %>',
   imports: [<% if(routing) { %>RouterOutlet<% } %>],<% if(inlineTemplate) { %>
   template: `
-    <h1>Welcome to {{ title() }}!</h1>
+    <h1>Hello, {{ title() }}</h1>
 
     <% if (routing) {
      %><router-outlet /><%