[Glimmer 2] Remove tests related to legacy ember-test-helpers

These tests are specifically testing patterns that used to be used in
ember-test-helpers. Since these tests have been introduced
ember-test-helpers has moved to the container pattern with
`lookupFactory`. In general we need to start migrating tests away from
things that did not come out of the container with injections on them.

This is because we need to remove this hardcoded `InteractiveRenderer`
[here](https://github.com/emberjs/ember.js/blob/master/packages/ember-views/lib/views/core_view.js#L46-L52)

packages/ember/tests/helpers/link_to_test.js

@@ -8,14 +8,11 @@ import { subscribe, reset } from 'ember-metal/instrumentation';
 import isEnabled from 'ember-metal/features';
 import alias from 'ember-metal/alias';
 import Application from 'ember-application/system/application';
-import Component from 'ember-templates/component';
-import ComponentLookup from 'ember-views/component_lookup';
 import jQuery from 'ember-views/system/jquery';
 import EmberObject from 'ember-runtime/system/object';
 import inject from 'ember-runtime/inject';
 import { A as emberA } from 'ember-runtime/system/native_array';
 import NoneLocation from 'ember-routing/location/none_location';
-import { OWNER } from 'container/owner';
 import { compile } from 'ember-template-compiler/tests/utils/helpers';
 import { setTemplates, set as setTemplate } from 'ember-templates/template_registry';
 
@@ -99,45 +96,6 @@ QUnit.module('The {{link-to}} helper', {
   teardown: sharedTeardown
 });
 
-// These two tests are designed to simulate the context of an ember-qunit/ember-test-helpers component integration test,
-// so the container is available but it does not boot the entire app
-test('Using {{link-to}} does not cause an exception if it is rendered before the router has started routing', function(assert) {
-  Router.map(function() {
-    this.route('about');
-  });
-
-  appInstance.register('component-lookup:main', ComponentLookup);
-
-  let component = Component.extend({
-    [OWNER]: appInstance,
-    layout: compile('{{#link-to "about"}}Go to About{{/link-to}}')
-  }).create();
-
-  let router = appInstance.lookup('router:main');
-  router.setupRouter();
-
-  run(function() {
-    component.appendTo('#qunit-fixture');
-  });
-
-  assert.strictEqual(component.$('a').length, 1, 'the link is rendered');
-});
-
-test('Using {{link-to}} does not cause an exception if it is rendered without a router.js instance', function(assert) {
-  appInstance.register('component-lookup:main', ComponentLookup);
-
-  let component = Component.extend({
-    [OWNER]: appInstance,
-    layout: compile('{{#link-to "nonexistent"}}Does not work.{{/link-to}}')
-  }).create();
-
-  run(function() {
-    component.appendTo('#qunit-fixture');
-  });
-
-  assert.strictEqual(component.$('a').length, 1, 'the link is rendered');
-});
-
 QUnit.test('The {{link-to}} helper moves into the named route', function() {
   Router.map(function(match) {
     this.route('about');