minor symfony#45651 Remove blocking test for adding support for placeholders in EmumNode in 6.1 (ecourtial)

This PR was merged into the 4.4 branch.

Discussion
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Remove blocking test for adding support for placeholders in EmumNode in 6.1

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

Remove blocking test for the PR symfony#45624

Commits
-------

a0bce33 Remove blocking test for adding support for placeholders in EmumNode in 6.1

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php

@@ -156,19 +156,6 @@ public function testConcatenatedEnvInConfig()
         $this->assertSame(['scalar_node' => $expected], $container->resolveEnvPlaceholders($ext->getConfig()));
     }
 
-    public function testEnvIsIncompatibleWithEnumNode()
-    {
-        $this->expectException(InvalidConfigurationException::class);
-        $this->expectExceptionMessage('A dynamic value is not compatible with a "Symfony\Component\Config\Definition\EnumNode" node type at path "env_extension.enum_node".');
-        $container = new ContainerBuilder();
-        $container->registerExtension(new EnvExtension());
-        $container->prependExtensionConfig('env_extension', [
-            'enum_node' => '%env(FOO)%',
-        ]);
-
-        $this->doProcess($container);
-    }
-
     public function testEnvIsIncompatibleWithArrayNode()
     {
         $this->expectException(InvalidConfigurationException::class);