`client.Client.Apply()` doesn't work with `unstructured.Unstructured`

[pmalek]

Problem statement

client.Apply has been deprecated (#3321) in favor of using client.Client.Apply().

This breaks users working with unstructured.Unstructured.

Using client.Client.Patch() users were able to use client.Object. With client.Client.Apply() it is required to provide runtime.ApplyConfiguration which unstructured.Unstructured does not provide.

[alvaroaleman]

@pmalek please use client.ApplyConfigurationFromUnstructured, upstream didn't want unstructured.Unstructured to be a an Applyconfiguration: kubernetes/kubernetes#132194 (comment)

Please feel free to start a discussion about that in the kubernetes/kubernetes repo if you want to be able to use it as ApplyConfiguration without the wrapper, it is not possible for controller-runtime to make that work.