Replace https://github.com/openshift/installer/tree/master/upi/vsphere with powercli.  Keep terraform in place until powercli installations are working.

• Update UPI image with powershell and powercli
• Backport change through all supported releases
• Update installer repo with powercli scripts
• Update installer repo to remove UPI terraform

example of updates to be made to the upi image:

~~~
FROM upi-installer-image
RUN curl https://packages.microsoft.com/config/rhel/8/prod.repo | tee
/etc/yum.repos.d/microsoft.repo

RUN yum install -y powershell

RUN pwsh -Command 'Install-Module VMware.PowerCLI -Force -Scope
CurrentUser'
~~~