QA:Testcase Preupgrade from older release

Description

This case tests upgrading a Fedora system from the previous stable release (Fedora 40) to the development release (Fedora 42) using PreUpgrade.

Note
This test requires you to have a wired connection to the internet during the install.

How to test

1. Perform an installation of the previous stable release (e.g. Fedora 40) with default partitioning (200MB for /boot).
2. Install the newest available version of preupgrade and python-urlgrabber
3. Run preupgrade from a command prompt or the Run Application dialog. Provide the requested password for root authorization.
4. On the Choose desired release screen, enable unstable test releases.
5. Choose Fedora 42 (Branched) from the list of available upgrade targets, then click Apply.
6. While downloading, preupgrade should warn that there wasn't enough space to download install.img but it can be downloaded after reboot if you have a wired network connection. Click continue for that.
7. When the process completes, click Reboot.
8. The system should reboot, perform the upgrade, and reboot into the new system automatically.
9. Log in to upgraded system, open a terminal, file browser, or other system applications.

Expected Results

1. The preupgrade utility will run to completion, without error.
2. The user is prompted with a warning indicating Not enough space to download install.img. Preupgrade will allow the update to continue.
3. The system should be upgraded to new version without error.
4. The opened terminal, file browser, or other system applications should display and work correctly.