🌱 E2E: Use UEFI

[lentzi90]

What this PR does / why we need it:

Switch e2e tests to UEFI instead of Legacy.
(Second attempt)

Fixes #1607

Checklist:

• Documentation has been updated, if necessary.
• Unit tests have been added, if necessary.
• E2E tests have been added, if necessary.
• Integration tests have been added, if necessary.

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[lentzi90]

/hold
WIP

[MahnoorAsghar]

Did we mean to remove the UEFI block entry too?

[lentzi90]

I just tried to remove everything that isn't strictly necessary. This part is all default values from what I understand so it is not needed.

The last missing thing in this PR (I think) is the image we use for provisioning tests. I can see inspection is passing, so IPA is able to boot with UEFI. However, the ssh test after Cirros has been written to disk fails. I have been meaning to try a centos/ubuntu image instead to check if that is the issue, but so far I didn't manage to find the time.
There may also be something more wrong with the IPMI test. Perhaps there is some issue when doing PXE -> UEFI.