#### Changelog - (have added an entry)
#### PR Description
This PR resolves https://github.com/hasura/graphql-engine/issues/6284.
- Updates the API being used as the issue requires.
- Places a check to raise an error whenever the user tries to save the custom_fields without _any_ input (it was possible in the previous versions of the console)
- Updated form (picture)
<img width="745" alt="image" src="https://user-images.githubusercontent.com/6604943/103933740-d866a480-5149-11eb-90b2-e1c1c4559902.png">
Co-authored-by: Aleksandra Sikora <9019397+beerose@users.noreply.github.com>
GitOrigin-RevId: df3127c3c58b5ecf2d6ab79cb95610a96592ca12
