fix: tests

The original PR #4496 targeting **master** already includes the `private TrashManager $trashManager;` property declaration and the `use` import. The diff shows it properly adds both.

The backport PR #4497 **lost the property declaration** during the backport process. The PR description even warns about this: "This backport's changes differ from the original and might be incomplete."

What likely happened: the `master` branch and `stable32` branch have slightly different property orderings or surrounding context in `TrashBackendTest.php` (e.g., `master` doesn't have the `ACLManager` property, or they're in a different order). When the automated backport tool cherry-picked the changes, the hunk adding `private TrashManager $trashManager;` failed to apply cleanly and was silently dropped, while the code in `setUp()` and the new test method that *uses* `$this->trashManager` did apply — resulting in the mismatch.

Signed-off-by: Iva Horn <iva.horn@nextcloud.com>

Author: i2h3

tests/Trash/TrashBackendTest.php

@@ -38,6 +38,7 @@ class TrashBackendTest extends TestCase {
 
 	private string $folderName;
 	private TrashBackend $trashBackend;
+	private TrashManager $trashManager;
 	private FolderManager $folderManager;
 	private ACLManager $aclManager;
 	private RuleManager $ruleManager;
@@ -330,7 +331,7 @@ public function testMoveToTrashSameNameDifferentSubfolders(): void {
 
 		// Verify the DB records exist
 		$dbRows = $this->trashManager->listTrashForFolders([$this->folderId]);
-		$dbReadmeRows = array_values(array_filter($dbRows, fn ($row) => $row['name'] === 'Readme.md'));
+		$dbReadmeRows = array_values(array_filter($dbRows, fn (array $row) => $row['name'] === 'Readme.md'));
 		$this->assertCount(2, $dbReadmeRows, 'Both Readme.md entries should exist in oc_group_folders_trash');
 
 		$this->logout();