Feature Request: Add right-click menu for clipboard actions (copy/paste) between host and Multipass instance

Reference: #4180

It would be really helpful to have a right-click context menu inside the Multipass shell window that allows basic clipboard operations like copy, paste, and possibly select all.

This would greatly improve usability when working with Multipass instances from the host machine, especially for users who frequently copy commands, configuration snippets, or output in and out of the environment.

[levkropp]

Closing as the terminal in the GUI already has a right click menu, with select-all being implemented recently in #4211