All new terminal UI actions except for ctrl+shift+tilde (which remains unchanged)
now show a workspace selector in a multi-root context. This includes:

- The plus button on the panel
- The new terminal option in the term quick open
- The context menu shown by right clicking the terminal area

Fixes #34163

Fixes #35763

Fixes #35666

Fixes #36187

fixes JS error "Cannot read property 'charAt' of undefined"