Remove Hyper-V driver

Nova Hyper-V driver is not maintained for many cycles, it is
not tested in OpenStack upstream and no maintainers. Previous
and the only maintainers of this driver had changed their
business focus and cannot maintain the HyperV driver or
its dependencies.
- https://lists.openstack.org/pipermail/openstack-discuss/2022-November/031044.html

Nova HyperV driver is dependent on the os-win package of
Winstacker project which is also retired now.
- https://review.opendev.org/q/topic:retire-winstackers

Nova Hyper-V driver was `marked experimental <https://review.opendev.org/c/openstack/nova/+/863910>`_
in 2023.2 release.

Proposal in this BP is to remove the Hyper-V driver because it is not
tested, no maintainer, and its dependencies is also retired.

With this driver going, we need to return 400 error code for the below APIs as
those are only for Hyper-V driver

1. Get RDP Console old deprecated API:

    POST /servers/{server_id}/action (os-getRDPConsole Action)

2. RDP protocol support from new API for remote console:

    POST /servers/{server_id}/remote-consoles