efi/preinstall: RunChecksContext.Run should return immediately if there is a pending PPI operation #451
Description
After executing a PPI operation, there needs to be either a reboot or shutdown for the operation to be handled by the platform firmware, as indicated by the result of the call to RunChecksContext.Run. In this case, subsequent calls to RunChecksContext.Run should return immediately with the same response as opposed to re-running tests, as the operation may clear more than one error.
To implement this properly, we need to be able to obtain the pending PPI operation via the go-tpm2 ppi.PPI interface, but it isn't supported yet.