minor symfony#58424 [DoctrineBridge] Fix risky test warnings (alexandre-daubois)

This PR was merged into the 5.4 branch.

Discussion
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[DoctrineBridge] Fix risky test warnings

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

PHPUnit raises warning for these tests and consider them risky because they don't perform assertions (which is normal).

Commits
-------

41327bd [DoctrineBridge] Fix risky test warnings

Author: nicolas-grekas

src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php

@@ -24,7 +24,7 @@
  */
 class EntityTypePerformanceTest extends FormPerformanceTestCase
 {
-    private const ENTITY_CLASS = 'Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity';
+    private const ENTITY_CLASS = SingleIntIdEntity::class;
 
     /**
      * @var \Doctrine\ORM\EntityManager

src/Symfony/Component/Form/Test/FormPerformanceTestCase.php

@@ -45,6 +45,8 @@ private function doRunTest()
             $this->fail(sprintf('expected running time: <= %s but was: %s', $this->maxRunningTime, $time));
         }
 
+        $this->expectNotToPerformAssertions();
+
         return $result;
     }