Remove deleteRecursive callback, but I think it might still be needed. Let us...

Remove deleteRecursive callback, but I think it might still be needed. Let us at least see if any tests fail.

Closes #3429268

tests/src/Build/CoreUpdateTest.php

@@ -470,7 +470,7 @@ class CoreUpdateTest extends UpdateTestBase {
     $pattern = '/^Unused stage directory deleted: (.+)$/m';
     $matches = [];
     preg_match($pattern, $output, $matches);
-    $this->assertCount(2, $matches);
+    $this->assertCount(2, $matches, $output);
     $this->assertDirectoryDoesNotExist($matches[1]);
 
     // Rerunning the command should exit with a message that no newer version