There's really no point in first extracting a command line from an UKI to just pass it unmodified to the UKI. In particular as this is systematically ignored in SecureBoot is enabled. Let's drop this, so that unless the user actually edits the cmdline we pass nothing to the invoked kernel. Note that this low-key is a compat break, since the passed cmdline gets measured. However, in the interest of minimized the difference between systems with and without sd-boot to behave the same i think we should suppress the command line anyway.
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