[BUGFIX beta] Remove Namespace processing

Ember no longer uses Namespaces in the `toString` on classes, so there's
no reason to eagerly process namespaces on application boot. This is
currently triggering the deprecation message in new Ember applications
on Beta, so this removes it to prevent that.

(cherry picked from commit e1323e2)

packages/@ember/application/lib/application.js

@@ -5,14 +5,10 @@
 import { dictionary } from '@ember/-internals/utils';
 import { ENV } from '@ember/-internals/environment';
 import { hasDOM } from '@ember/-internals/browser-environment';
-import { assert, isTesting } from '@ember/debug';
+import { assert } from '@ember/debug';
 import { DEBUG } from '@glimmer/env';
 import { join, once, run, schedule } from '@ember/runloop';
-import {
-  libraries,
-  processAllNamespaces,
-  setNamespaceSearchDisabled,
-} from '@ember/-internals/metal';
+import { libraries } from '@ember/-internals/metal';
 import { _loaded, runLoadHooks } from './lazy_load';
 import { RSVP } from '@ember/-internals/runtime';
 import { EventDispatcher, jQuery, jQueryDisabled } from '@ember/-internals/views';
@@ -828,11 +824,6 @@ const Application = Engine.extend({
 
     try {
       // TODO: Is this still needed for _globalsMode = false?
-      if (!isTesting()) {
-        // Eagerly name all classes that are already loaded
-        processAllNamespaces();
-        setNamespaceSearchDisabled(true);
-      }
 
       // See documentation on `_autoboot()` for details
       if (this.autoboot) {
@@ -887,8 +878,6 @@ const Application = Engine.extend({
   willDestroy() {
     this._super(...arguments);
 
-    setNamespaceSearchDisabled(false);
-
     if (_loaded.application === this) {
       _loaded.application = undefined;
     }