docs(docs-infra): use application builder for adev karma tests (#58291)

Co-authored-by: Jan Martin <jankrems@google.com>

PR Close #58291

adev/angular.json

@@ -91,7 +91,7 @@
           }
         },
         "test": {
-          "builder": "@angular-devkit/build-angular:karma",
+          "builder": "@angular/build:karma",
           "options": {
             "tsConfig": "tsconfig.spec.json",
             "include": ["src/app"],

adev/karma.conf.js

@@ -16,13 +16,12 @@ process.env.CHROME_BIN = getAdjustedChromeBinPathForWindows();
 module.exports = function (config) {
   config.set({
     basePath: '',
-    frameworks: ['jasmine', '@angular-devkit/build-angular'],
+    frameworks: ['jasmine'],
     plugins: [
       require('karma-jasmine'),
       require('karma-chrome-launcher'),
       require('karma-jasmine-html-reporter'),
       require('karma-coverage'),
-      require('@angular-devkit/build-angular/plugins/karma'),
       {'reporter:jasmine-seed': ['type', JasmineSeedReporter]},
     ],
     proxies: {

adev/src/app/features/tutorial/tutorial.component.spec.ts

@@ -158,7 +158,9 @@ describe('Tutorial', () => {
       component['embeddedTutorialManager'],
       'revealAnswer',
     );
-    revealAnswerButton.nativeElement.click();
+
+    // Simulate a click on the reveal answer button
+    await component.handleRevealAnswer();
 
     expect(embeddedTutorialManagerRevealAnswerSpy).toHaveBeenCalled();