Test suite: UEFI boot

We should have a Cucumber scenario to automatically test UEFI boot. It should check that /sys/firmware/efi exists, to confirm that the system did boot with UEFI.

Feature Branch: test/7231-uefi-boot

Subtasks

#7606 (closed)

Related issues

Related to #5739 (closed)
Blocked by #6578 (closed)
Blocked by #7173 (closed)

Original created by @intrigeri on 7231 (Redmine)

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