Issue #3245996: Move basic exclusions and test coverage into Package Manager

package_manager/src/EventSubscriber/ExcludedPathsSubscriber.php

@@ -123,23 +123,11 @@ class ExcludedPathsSubscriber implements EventSubscriberInterface {
       'settings.local.php',
       'services.yml',
     ];
+    $default_site = 'sites' . DIRECTORY_SEPARATOR . 'default';
+
     foreach ($settings_files as $settings_file) {
-      $file_path = implode(DIRECTORY_SEPARATOR, [
-        $this->appRoot,
-        $this->sitePath,
-        $settings_file,
-      ]);
-      $file_path = $this->fileSystem->realpath($file_path);
-      if (file_exists($file_path)) {
-        $event->excludePath($file_path);
-      }
-
-      $default_file_path = implode(DIRECTORY_SEPARATOR, [
-        'sites',
-        'default',
-        $settings_file,
-      ]);
-      $event->excludePath($default_file_path);
+      $event->excludePath($this->sitePath . DIRECTORY_SEPARATOR . $settings_file);
+      $event->excludePath($default_site . DIRECTORY_SEPARATOR . $settings_file);
     }
   }