Add a delete icon to Hidden Terminals menu item

[hawkticehurst]

Currently, in order to delete/clean up hidden terminals created by AI models I need to:

1. Click the Hidden Terminals menu item in the terminal side bar
2. Select a hidden terminal in the command palette to open it
3. Click the trash icon in the terminal side bar for the given terminal menu item
4. Repeat for every single hidden terminal

It would be great if the Hidden Terminal menu item also had a trash icon so I could clear them all in one swoop.

[Tyriar]

I'd use this too 👍