Remove the remainders of the Avocado tests

Now that all Avocado tests have been converted to or been replaced by
other functional tests, we can delete the remainders of the Avocado
tests from the QEMU source tree.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20250414113031.151105-16-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
14 files changed