KVM: arm64: selftests: Check the pending SError state in external_aborts

None of the external abort tests look at the vCPU events once the guest
is done, so an SError left pending after the guest took it, or dropped
while the guest had it masked, goes unnoticed.

Read the vCPU events back at the end of every test that runs the guest.
The SError must still be pending in the masked case, with the injected
ESR when the vCPU has RAS, and no SError, injected or spurious, may be
pending in any of the others.

Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Link: https://patch.msgid.link/20261006092841.2202109-1-fuad.tabba@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

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