minor #50087 [Config] Improve GlobResource performance (clxmstaab)

This PR was merged into the 6.3 branch.

Discussion
----------

[Config] Improve GlobResource performance

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->
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Re-order conditions in GlobResource to prevent unnecessary file IO, which improves performance of the following test-script.

put this script into the symfony/symfony project root and run it
```php
<?php

error_reporting(E_ALL);

require __DIR__.'/vendor/autoload.php';

$glob = new \Symfony\Component\Config\Resource\GlobResource(__DIR__.'/src/', '/**/*.php', true);
foreach($glob as $file) {
    echo $file->getRealPath()."\n";
}
```

I did a few measures and it consistently reports a 15-18% improvement

![grafik](https://user-images.githubusercontent.com/120441/233592449-2844bad8-6217-4ec9-a387-a83bd18a6269.png)

https://blackfire.io/profiles/compare/647af42c-c4e5-495e-8f8d-1b77f61631dd/graph

Commits
-------

172b1f7 [Config] Improve GlobResource performance

src/Symfony/Component/Config/Resource/GlobResource.php

@@ -97,7 +97,7 @@ public function __wakeup(): void
 
     public function getIterator(): \Traversable
     {
-        if (!file_exists($this->prefix) || (!$this->recursive && '' === $this->pattern)) {
+        if ((!$this->recursive && '' === $this->pattern) || !file_exists($this->prefix)) {
             return;
         }
 
@@ -148,7 +148,7 @@ public function getIterator(): \Traversable
                     } while ($prefix !== $dirPath && $dirPath !== $normalizedPath = \dirname($dirPath));
                 }
 
-                if (is_file($path) && (null === $regex || preg_match($regex, substr(str_replace('\\', '/', $path), $prefixLen)))) {
+                if ((null === $regex || preg_match($regex, substr(str_replace('\\', '/', $path), $prefixLen))) && is_file($path)) {
                     yield $path => new \SplFileInfo($path);
                 }
                 if (!is_dir($path)) {
@@ -165,7 +165,7 @@ public function getIterator(): \Traversable
                     new \RecursiveCallbackFilterIterator(
                         new \RecursiveDirectoryIterator($path, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS),
                         fn (\SplFileInfo $file, $path) => !isset($this->excludedPrefixes[$path = str_replace('\\', '/', $path)])
-                            && (null === $regex || $file->isDir() || preg_match($regex, substr($path, $prefixLen)))
+                            && (null === $regex || preg_match($regex, substr($path, $prefixLen)) || $file->isDir())
                             && '.' !== $file->getBasename()[0]
                     ),
                     \RecursiveIteratorIterator::LEAVES_ONLY