Issue #3463544 by catch: Three more slow functional tests

(cherry picked from commit a01c36cc)

core/modules/file/tests/src/Functional/FileListingTest.php

@@ -13,6 +13,7 @@
  * Tests file listing page functionality.
  *
  * @group file
+ * @group #slow
  */
 class FileListingTest extends FileFieldTestBase {
 

core/modules/shortcut/tests/src/Functional/ShortcutSetsTest.php

@@ -10,6 +10,7 @@
  * Create, view, edit, delete, and change shortcut sets.
  *
  * @group shortcut
+ * @group #slow
  */
 class ShortcutSetsTest extends ShortcutTestBase {
 

core/modules/system/tests/src/Functional/Batch/ProcessingTest.php

@@ -11,6 +11,7 @@
  * Tests batch processing in form and non-form workflow.
  *
  * @group Batch
+ * @group #slow
  */
 class ProcessingTest extends BrowserTestBase {