This commit introduces a validation rule to limit the number of selectors
in a DeviceClass to 32. This is done by adding the `+k8s:maxItems=32`
marker to the DeviceClassSpec and running the code generator.

The following changes are included:
- Updated `staging/src/k8s.io/api/resource/v*/types.go` with the validation marker.
- Regenerated validation code in `pkg/apis/resource/v*/zz_generated.validations.go`.
- Improved error message in `pkg/apis/resource/validation/validation.go`.
- Added tests in `pkg/registry/resource/deviceclass/declarative_validation_test.go`
  to cover the new validation.

Kubernetes-commit: e693da729066f1f773973f02a2da4f9475562aab

Kubernetes-commit: 515b579945ab54ef4e008a9fbe6d3bb19123594d

feat(resource): Add validation for DeviceClass selectors and configs

Kubernetes-commit: ab89efc573d01f4836d64d50ff1958a833c543d0