Inform user about deleting consumers before deleting event types

[thomasabraham]

Inform the users that they should delete the subscriptions before deleting event types. This is because Nakadi will refuse to delete event types with active subscriptions.

[Kunal-Jha]

@thomasabraham It looks good. But don't you think we should also have some sort of warning for Nakadi SQL queries?

[SergKam]

If you need any help feel free to ask me. I know that the testing set up a bit tricky here.

[rcillo]

@thomasabraham the code looks good. Could you please add a screenshot of the dialog, just to give an idea of where the new panel will be?

[rcillo]

👍

[thomasabraham]

👍