QA:Testcase Anaconda Upgrade Skip Bootloader

Description

This case tests upgrading from the current stable release (Fedora 41) to the development release (Fedora 42) while skipping any updates to the existing bootloader configuration.

How to test

1. Perform a default installation of the previous Fedora release (Fedora 41) and verify it works correctly
2. Take a note of the bootloader configuration prior to upgrade
3. Boot the Fedora 42 installer using any available means (boot.iso, PXE or DVD.iso)
4. After anaconda is started successfully,select default language,keyoard, and then select Upgrade an existing installation
5. Select Skip bootloader updating to upgrade
6. After upgrade finished, examine bootloader configuration, compare to bootloader configuration prior to upgrade
7. Make any necessary manual changes to bootloader configuration to render system bootable
8. Boot and test the system

Expected Results

1. The system should be upgraded to Fedora 42 version without error
2. The previous bootloader configuration should be left completely untouched, even if it is now invalid (unbootable)
3. After any necessary manual bootloader re-configuration to render the system bootable again, it should boot and work without problems