Remove this.compile() usage from test files

- life-cycle-test: use template() from @ember/template-compiler/runtime
  instead of this.compile() for setting component templates
- template-factory-test: import compile directly from internal path
  (this test specifically tests TemplateFactory behavior)
- multiple-app-test: import compile directly from internal path
  (registers route templates needing TemplateFactory)

No test files call this.compile() anymore — it's now purely an
internal implementation detail of the test case base classes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NullVoxPopuli

packages/@ember/-internals/glimmer/tests/integration/components/life-cycle-test.js

@@ -6,6 +6,7 @@ import { A as emberA } from '@ember/array';
 import { getViewElement, getViewId } from '@ember/-internals/views';
 import { precompileTemplate } from '@ember/template-compilation';
 import { setComponentTemplate } from '@glimmer/manager';
+import { template as runtimeTemplate } from '@ember/template-compiler/runtime';
 
 import { Component } from '../../utils/helpers';
 
@@ -289,7 +290,7 @@ class LifeCycleHooksTest extends RenderingTestCase {
     };
 
     if (typeof template === 'string') {
-      setComponentTemplate(this.compile(template), ComponentClass);
+      runtimeTemplate(template, { component: ComponentClass, strictMode: false });
     }
     this.owner.register(`component:${name}`, ComponentClass);
   }

packages/@ember/-internals/glimmer/tests/unit/template-factory-test.js

@@ -1,5 +1,6 @@
 import { ENV } from '@ember/-internals/environment';
 import { RenderingTestCase, moduleFor } from 'internal-test-helpers';
+import compile from 'internal-test-helpers/lib/compile';
 
 import { template, templateCacheCounters } from '@ember/-internals/glimmer';
 import { precompile } from 'ember-template-compiler';
@@ -23,7 +24,7 @@ moduleFor(
       let exports = {};
       module(exports, template);
       let Precompiled = exports['default'];
-      let Compiled = this.compile('Hello {{this.name}}', options);
+      let Compiled = compile('Hello {{this.name}}', options);
 
       assert.equal(typeof Precompiled, 'function', 'precompiled is a factory');
       assert.equal(typeof Compiled, 'function', 'compiled is a factory');

packages/ember/tests/integration/multiple-app-test.js

@@ -1,4 +1,5 @@
 import { moduleFor, ApplicationTestCase, runTask } from 'internal-test-helpers';
+import compile from 'internal-test-helpers/lib/compile';
 import Application from '@ember/application';
 import { Component } from '@ember/-internals/glimmer';
 import { getOwner } from '@ember/-internals/owner';
@@ -66,7 +67,7 @@ moduleFor(
 
       resolver.add(
         'template:index',
-        this.compile(
+        compile(
           `
         <h1>Node 1</h1>{{special-button}}
       `