Extend bootupd test to include testing adoption and updates

[travier]

Describe the enhancement

Can probably borrow some idea from upstream tests.

System details

N/A

Additional information

Would have helped with:

• /boot/efi is unlabeled_t since version 40.20240504.3.0 #1771
• Missing SELinux rules (was: Empty bootupctl status since 0.2.20) bootupd#694
• https://bugzilla.redhat.com/show_bug.cgi?id=2300306

[jlebon]

And also strengthen the current bootupd test to sanity-check the output of bootupctl status:
https://github.com/coreos/fedora-coreos-config/blob/testing-devel/tests/kola/boot/bootupd

One easy way to sanity-check it is to look for the NEVRAs of the installed grub and shim packages in the output since in the context of this test, we're guaranteed to be running the same contentset the bootloader was installed from.

[HuijingHei]

sanity-check the output of bootupctl status: coreos/fedora-coreos-config#3130

[travier]

Another potential test would be to:

• Overwrite an existing file in the ESP
• Verify that bootupctl validate now fails
• Remove /boot/bootupd-state.json
• Adopt / update again
• Verify that validate is successful