Add toggles for `requireEmailUpfront` and `showAgentAvailability` on getting started page on dashboard

Is your feature request related to a problem? Please describe. When a non technical user wants to customize the widget for requiring email upfront and showing agent availability they can't do it through the GUI.

Describe the solution you'd like There should be a toggle for both requireEmailUpFront and showAgentAvailability in the https://github.com/papercups-io/papercups/blob/master/assets/src/components/account/GettingStartedOverview.tsx#L242 section where it generates and the flags for the widget

Additional context This is a customer request from inStock