[API][Admin][News] Verify that the news cannot be updated if the mandatory field 'imageId' is empty using UPDATE method

[Skyfall711]

Priority: High

Preconditions

1. Postman is opened
2. User is authorized
3. The UPDATE method is chosen
4. All required data has been added to the body:
   {
   "title": "string",
   "text": "string",
   "imageId": 0,
   "url": "string",
   "creationDate": "2025-01-05T10:54:23.865Z",
   "id": 0
   }

Steps to reproduce

1. Input a valid endpoint https://backend.historycode.online/api/News/Update
2. Leave the field 'imageId' empty
3. Click the 'Send' button

Expected result
The news isn't updated- status code '400 Bad Request '
Error messages in response body appears:
"The ImageId is required."

User story: #835