No confirmation when closing tab (GTK)

[leigholiver]

On the discord this bit of feedback came up from here

8323 # - ghostty has tabs (imitating gnome-terminal); when closing a tab with a
8324 #   running process (e.g., a hung vttest), ghostty does not prompt about the 
8325 #   process to be killed.

On investigation there are two places in the GTK apprt where tabs are directly closed/removed without checking for confirmation/running processes (1, 2)

[mitchellh]

You should create a discussion first but given this was from the terminfo feedback I'll accept it. Thanks

[leigholiver]

Apologies!