IgUpload server side event is not canceled

[MonikaKirkova]

Description

IgUpload server side UploadStarting event could not be canceled

• ignite-ui version: any
• browser: any

Steps to reproduce

1. Create a project with .Net 8
2. Register the UploadStarting event handler in the Program.cs file
3. In the event handler cancel the event.

Result

The client side fileUploaded event is emitted and the file is uploaded.

Expected result

The client side onError event should be emitted and the file should not be uploaded.