fix: add confimation dialog and use it to handle discard ticket

[joshuarestivo]

Previously, the Discard button in the New Ticket view only cleared the contents of the editor. This was non-intuitive and not terribly useful. This PR creates a confirmation dialog component that is called by the Discard button. Selecting 'Yes' on the dialog routes the user back to the appropriate Ticket list view (Agent or Customer).

[RitvikSardana]

Good PR @joshuarestivo .

Please remove package-lock.json file changes

also can you add the same for:

When a ticket is closed from customer portal, a confirmation popup should show.

[joshuarestivo]

Happy to get rid of package-lock.json. Regarding closing a ticket from the customer portal, currently when you do that, a 'Rate this ticket' dialog appears. Do you want the confirmation instead of the ticket rating?

I've never been a fan of forced rating myself. I guess we could put a switch in Settings to select the desired close action (Rate Ticket or Confirm and Close).

Let me know your thoughts.

[RitvikSardana]

Hey joshua, I added the confirmation dialog along with this feature #2058

Thanks for the PR.