Azure Form Recognizer client library samples for TypeScript

[FormRecognizer] Copy Model API (#9068)

* Add support for copy model API

* Add copyModel samples

* The result from copy model should be CustomFormModelInfo

Add copy model test

* Update sdk/formrecognizer/ai-form-recognizer/src/formTrainingClient.ts

Co-authored-by: Krista Pratico <krpratic@microsoft.com>

* Include original result from service in returned authorization

* format code

* Uncomment samples code to use real package

* Remove redundant properties

* Fix test-resources.json

* Remove unused `CopyResult` type

* Address CR feedback

- Extends from CopyAuthorizationResultModel

- Add documentation

Co-authored-by: Krista Pratico <krpratic@microsoft.com>