test(ivy): improve error message for the compiler compliance test (#25291)

before:

```
Expected to find features 'import * as i0 from "@angular/core";
import { Directive, Input } from '@angular/core';

```

after:

```
Failed to find "template" after "...Component_Factory() { return new
MyComponent(); }," in:
'import * as i0 from "@angular/core";
import { Directive, Input } from '@angular/core';```

```

PR Close #25291

packages/compiler-cli/test/compliance/mock_compiler_spec.ts

@@ -7,7 +7,7 @@
  */
 
 
-import {MockDirectory, setup} from '@angular/compiler/test/aot/test_util';
+import {setup} from '@angular/compiler/test/aot/test_util';
 import {compile, expectEmit} from './mock_compile';
 
 describe('mock_compiler', () => {