[9.x] Allow cleanup of databases when using parallel tests (#41806)

* feat: allow cleanup up of created databases in parallel tests

* Update TestDatabases.php

Co-authored-by: Taylor Otwell <[email protected]>

Author: abenerd

src/Illuminate/Testing/Concerns/TestDatabases.php

@@ -61,6 +61,16 @@ protected function bootTestDatabase()
                 });
             }
         });
+
+        ParallelTesting::tearDownProcess(function () {
+            $this->whenNotUsingInMemoryDatabase(function ($database) {
+                if (ParallelTesting::option('drop_databases')) {
+                    Schema::dropDatabaseIfExists(
+                        $this->testDatabase($database)
+                    );
+                }
+            });
+        });
     }
 
     /**