Allow changing commands for inbuilt UI buttons for VSCode terminal

[hpgupt]

I am developing an extension where I am creating a custom VSCode Terminal from the extension, for the delete/kill terminal button (trashcan icon) that appears on every terminal, I want to execute my own function when that trashcan icon is clicked, is there a way to override existing command ? I can't use the onTerminalClose listener as it runs when vscode closes too, which I don't want. If this can't be done is there a way to provide additional UI buttons for a VSCode terminal ?

[Tyriar]

We may allow the ability for extensions to contribute to the UI in the future, but no plans currently. #9285 would need to be handled first so if extensions add many actions they can be hidden manually. There is also #79034 which is similar.