fix vm removal in proxmox_pool_member.py (#7464)
* fix vm removal in proxmox_pool_member.py
in the original the vm doesn't get removed, always errors with "'Failed to delete a member (12345) from the pool TestPool: list.remove(x): x not in list'
* add changelog fragment
* fix linting errors in changelog
(cherry picked from commit 0304989392)
Co-authored-by: aungvari <12872375+aungvari@users.noreply.github.com>
