Add Prettier to test apps.

e2e-tests/test-applications/angular-17-test-app/package.json

@@ -32,6 +32,7 @@
     "karma-coverage": "~2.2.0",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
+    "prettier": "^3.4.2",
     "typescript": "~5.4.2"
   }
 }

e2e-tests/test-applications/angular-19-test-app/package.json

@@ -32,6 +32,7 @@
     "karma-coverage": "~2.2.0",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
+    "prettier": "^3.4.2",
     "typescript": "~5.6.2"
   }
 }