KVM: nVMX: Always handle #VEs in L0 (never forward #VEs from L2 to L1)

Always handle #VEs, e.g. due to prove EPT Violation #VE failures, in L0,
as KVM does not expose any #VE capabilities to L1, i.e. any and all #VEs
are KVM's responsibility.

Fixes: 8131cf5b ("KVM: VMX: Introduce test mode related to EPT violation VE")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20240518000430.1118488-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>