Auto-generate OpenAPIModelName() via openapi-gen (#3769)

Replace hand-written model_name.go with generated zz_generated.model_name.go
by adding +k8s:openapi-model-package marker to doc.go and running openapi-gen
in update_codegen.sh.

Update boilerplate.go.txt to remove Red Hat copyright.


Assisted-By: Claude

Signed-off-by: Todd Short <todd.short@me.com>

Author: tmshort

boilerplate.go.txt

@@ -1,6 +1,4 @@
 /*
-Copyright Red Hat, Inc.
-
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at