Enabling running DTS E2E tests on real hardware.

[DaniilKl]

The idea of DTS E2E tests is to test DTS workflows for every supported hardware automatically on QEMU going from DTS main menu up to rebooting. The workflows checked by the tests on QEMU are the same DTS workflows executed for a specific hardware, therefore these tests could be used on real hardware as well. This will also enable verifying correctness of executed tests, as described in #653.

Making DTS E2E tests to be able to execute on real platform is as easy as not exporting DTS shell variables responsible for platform simulation.

Depends on correctness of tests workflows, that is on #653.

Depends on #666 (comment) as well, because currently some platform are being tested manually.

[m-iwanicki]

Currently we have problems with network timeouts. It might be even worse on real hardware as some parts could take even more time, mostly flashrom commands, reading whole chip or worse flashing which reads whole chip, flashes some parts then reads chip again to verify. Related issue: #650

[artur-rs]

We would like to start with running CI DTS full test-suite on the MSI platform from our lab. @EduKav1813 will be responsible for support here.