This change updates the nova-next nodeset
to use openstack-two-node-noble and revert to
using qemu without nested virt.
using nested virt was a tempory messure to mitigate the kernel
panics we were seeing related to volume detach while we also explored
using split kernel images. since then we have reverted the other
jobs back to using normal whole disk images and we have not
seen a marked uptic in kernel panics.
as such this change drop the use of nested virt since the other jobs
are not using it an updates the nodeset to move nova-next to test on
ubuneu 24.04 (noble) on python 3.12
Depends-On: https://review.opendev.org/c/openstack/devstack/+/922427
Change-Id: I5059ba3c519efb18947a8f3d24868ce1c9289e3d
804bc98759