feat: remove @angular/http (#27038)

The legacy HTTP package was deprecated in v5 with the launch of
@angular/common/http. The legacy package hasn't been published
since v7, and will therefore not include a migration.

PR Close #27038

modules/playground/src/jsonp/app/jsonp_comp.ts

@@ -15,7 +15,7 @@ import {Component} from '@angular/core';
     <h1>people</h1>
     <ul class="people">
       <li *ngFor="let person of people">
-        hello, {{person['name']}}
+        hello, {{person.name}}
       </li>
     </ul>
   `