Fix possible leak when removing finalizers #6532
Description
Now finalizer is removed if all listed resources are not found. However, all read op is reading cache. It means some resources may not be "seen" when deleting.
Not only kubernetes resources but also data in PD may have this issue. For example, store is leak.
- Pod is created and the store is created.
- Instance is marked as offline.
- Store is still not be "seen". The instance is deleting.
- All resources are deleted.
We have to ensure all resources(k8s, PD data) are deleted. Do not depends on the cache data.