Merge tag 'qtest-20250509-pull-request' of https://gitlab.com/farosas/qemu into staging

Qtest pull request

- Fix migration-test invocation of qtest_init
- Simplify byte-swapping for virtio in libqos
- New cpu hotplug test for loongarch64

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* tag 'qtest-20250509-pull-request' of https://gitlab.com/farosas/qemu:
  tests/qtest/cpu-plug-test: Add cpu hotplug support for LoongArch
  tests/qtest/libqos: Avoid double swapping when using modern virtio
  qtest: introduce qtest_init_ext

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>