Deletion of Resources on Custom Resource deletion

currently if a mysqlinstancecontroller resource is deleted the underlying resources like the deployment , service , configmap etc are still present.

These must be removed on deletion of the resource.

首先，跟踪 MySQLInstanceController 针对 mysqlinstancecontroller 资源的协调和删除处理流程。检查底层的 Deployment、Service、ConfigMap 以及其他资源是如何创建的，然后验证删除自定义资源是否会将它们全部删除，并确认控制器的测试覆盖了这一行为。

由索引模型根据 Issue 内容生成。