Squish Tests: Can delete multiple configurations simultaneously

As a developer I would like to verify the following behaviour using Squish:

- Create some configurations.
- Delete the newly created configurations at the same time.
- Verify that all newly created configurations have been deleted correctly.

#### Additional info:
Could also test the same but for components.
To select multiple configurations we can pass a modifier to the mouse click function https://doc.qt.io/squish/java-convenience-api.html#mouseclick-objectorname-x-y-clicks-modifierstate-button.