Merge tag 'qtest-20251001-pull-request' of https://gitlab.com/farosas/qemu into staging

Qtest pull request

- Fix for qtest_get_machines QEMU var caching
- Fixes for migration-test in --without-default-devices build
- Preparation patches for cpr-exec test

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* tag 'qtest-20251001-pull-request' of https://gitlab.com/farosas/qemu:
  migration-test: strv parameter
  migration-test: migrate_args
  migration-test: misc exports
  migration-test: shm path accessor
  migration-test: only_source option
  tests/qtest: qtest_init_after_exec
  tests/qtest: qtest_qemu_spawn_func
  tests/qtest: qtest_create_test_state
  tests/qtest: qtest_qemu_args
  tests/qtest: export qtest_qemu_binary
  tests/qtest: optimize qtest_get_machines
  tests/qtest/migration: Fix cpr-tests in case the machine is not available
  tests/qtest: Add missing checks for the availability of machines

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>