Device Update - Add test generator and fix variable naming issue for version 2026-11-02 (#45629)

* Device Update 2026-11-02 fix variable naming and tests issue for Csharp and Java SDK

* remove tag to prevent doc early publish

* fix format

* Fix Software Update C# model names

* Disambiguate Software Update model rename

* add latset tag back

* Format Software Update client customization

* Avoid Software Update model name collision

* Rename Software Update model to UpdateContent

* Enable Python test and sample generation