QA:Testcase partitioning custom lvmthin

Associated release criterion
This test case is associated with the Fedora_42_Final_Release_Criteria#disk-layouts release criterion. If you are doing release validation testing, a failure of this test case may be a breach of that release criterion. If so, please file a bug and nominate it as blocking the appropriate milestone, using the blocker bug nomination page.

Description

A complete installation using LVM with thin provisioning for system partitions.

Setup

1. Prepare a test system with a working, supported storage device of sufficient size for a Fedora install, and a Fedora installation medium that uses the GTK-based installer. Do not use Fedora Workstation live on Fedora 41+, as that uses the webui-based installer.

How to test

1. Boot the GTK-based installer using any available means. Do not use Fedora Workstation live on Fedora 41+, as that uses the webui-based installer.
2. Proceed to the installer's main screen, making sensible choices, and enter the Installation Destination screen.
3. Ensure only the single target device you prepared is selected as the installation target disk.
4. Ensure the Custom option is selected under Storage Configuration, and complete this screen.
5. On the MANUAL PARTITIONING screen, delete all existing partitions (if any).
6. Pick 'LVM Thin Provisioning' from the New mount points will use the following partitioning scheme: drop-down
7. Click the Click here to create them automatically link
8. Complete the installation process, making sensible selections for all other installer options.
9. Boot the installed system.

Expected Results

1. The expected partition layout should be created on the target device(s).
2. The install process should complete successfully and the installed system should boot as expected.