minor symfony#52124 [HttpKernel] add missing class alias to satisfy autoloading (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
----------

[HttpKernel] add missing class alias to satisfy autoloading

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT

Commits
-------

2e67979 add missing class alias to satisfy autoloading

Author: xabbuh

src/Symfony/Component/HttpKernel/Debug/FileLinkFormatter.php

@@ -17,6 +17,10 @@
 
 class_exists(ErrorHandlerFileLinkFormatter::class);
 
+if (!class_exists(FileLinkFormatter::class, false)) {
+    class_alias(ErrorHandlerFileLinkFormatter::class, FileLinkFormatter::class);
+}
+
 if (false) {
     /**
      * @deprecated since Symfony 6.4, use FileLinkFormatter from the ErrorHandler component instead