Display error reason

[JonathanTurnock]

When a script results in an error this should be displayed to the end user in the notification coast

https://discord.com/channels/@me/1067570310758539364/1073929795785719818

[john681611]

Hey can we make the error message on
https://github.com/JonathanTurnock/dcsfiddle/blob/main/public/dcs-fiddle-server.lua#L447C9-L447C253
Less of a popup and more of an in-game message