Add mass scale-up UI to machine view

### To QA
- Use il and mv flags
- Drag a charm to the canvas and click deploy (it's under ecs so you'll have to close the inspector manually)
- Drag another charm to the canvas and click deploy (close the inspector)
- Switch to machine view and click the `[+]` button beside `Choose a service and add units`
- There should be no services
- Press `deploy` in the ecs toolbar
- The machine view panel will re-render and close the panel (this is a known bug, you'll have to trust me that the databinding works properly without doing a bunch of hacking on the machine view)
- You should see two machines in the machine column.
- **Hit `ctrl+s` to disable the simulator (else the machine view panel will keep re-rendering)**
- Click the `[+]` again and you should see the two services
- Enter values in the inputs and then click `Add Units`
- Close the machine view and click on the services to view their inspectors. They should now have more units.