test(Database): fix state leakage in MigrationRunnerTest by dropping all tables in tearDown

Author: gr8man

tests/system/Database/Migrations/MigrationRunnerTest.php

@@ -69,12 +69,7 @@ protected function tearDown(): void
     {
         parent::tearDown();
 
-        // To delete data with `$this->regressDatabase()`, set it true.
-        $this->migrate = true;
-        $this->regressDatabase();
-
-        $forge = Database::forge($this->db);
-        $forge->dropTable('migrations_lock', true);
+        $this->resetTables();
     }
 
     public function testLoadsDefaultDatabaseWhenNoneSpecified(): void