KVM: selftests: Automatically run xAPIC IPI migration test when possible

Rework the interface to the xAPIC IPI test to automatically run the
migration testcase if at least two NUMA nodes are found.  The test exists
specifically to validate KVM's handling of migration of the APIC backing
page, i.e. forcing end users to opt-in to running the test in migration
mode largely defeats the purpose of the test.

Run both the "sleeping" and "migration" testcases by default, e.g. so that
the more basic testcase will fail if KVM completely breaks IPI delivery.

Keep the -m / migration parameter so that infrastructure that wants to
specifically test the migration case can do so and not get false passes.

Reviewed-by: Shivank Garg <shivankg@amd.com>
Link: https://patch.msgid.link/20260903001625.2792367-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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