Include a toggle for disabling "Unexpected Request Failure" dialogs

It is sometimes necessary to send a request which will not get a correct response from the Server, as perhaps a debugger is attached to the Server side and the request is not allowed to proceed to the point of returning a response, or for other reasons it might be necessary to test an endpoint that will not return a response as expected by Insomnia for one reason or another.

In these events Insomnia now presents the a popup like the following to the user:
![unexpected-request-failure](

Along with presenting this pop-up the relevant information about the connection issues will also be written to the Console tab, and making many such requests means having to close a lot of these pop-up windows.

Please include an option to suppress these dialog windows regarding issues on the Server Side with the connection as this information is already surfaced to the user elsewhere.