Generate Apply Configurations for clientsets (`--with-applyconfig`)

The generated fake clientsets (e.g., nncfake.NewSimpleClientset) are marked as deprecated in newer client-gen output, suggesting the use of NewClientset. However, NewClientset is only available if apply configurations are generated (e.g., via --with-applyconfig).

Please update the code generation scripts to generate apply configurations so that downstream consumers can migrate away from deprecated NewSimpleClientset and benefit from better Server-Side Apply testing support.

Start by locating the code generation scripts and the current client-gen invocation. Update generation to include --with-applyconfig, then regenerate the clientsets and verify that apply configurations and the non-deprecated NewClientset are available for downstream testing.

Written by the indexing model from the issue text.