feat: delete a root stack after delete DELETE_FAILED resources

[go-to-k]

Now, once you delete a root stack and occurs DELETE_FAILED, this tool delete a root stack without DELETE_FAILED resources at first, then delete the rest resources.
However, if a part of DELETE_FAILED resources occurs errors, other resources are left and this tool exit. But the stack had been deleted, so it may be impossible to find the resources left behind.