Build on the changes from projectcalico#7260:
- Add a Windows cni-plugin hostprocess image, which will install the cni
  binaries and config on the host.
- Add a Windows node hostprocess image, which no longer needs to match
  the hosts' Windows version (e.g. only 1809 needs to be used and is
  supported on 2022).

base for windows HPC images.

Add uninstall-calico powershell script to be run in initContainer, which
will clean up non-HPC Calico installations from the host before starting
Calico Windows HPC.

Fix bug in confd-service.ps1

HPC when using containerd v1.7+

before substitution (this helps with operator testing).

…h containerd

v1.6+ (instead of requiring v1.7+).

…d with '$env:CONTAINER_SANDBOX_MOUNT_POINT').

Fix logic regarding CNI paths in uninstall-calico-hpc.ps1.

Fix bug in GetHostPath()

…ags()

to winutils.go and use them instead of upstream's InClusterConfig(),
BuildConfigFromFlags() in order to get Windows HPC to work with containerd v1.6.
(tests intentionally left untouched in order to try to catch
discrepancies in behavior from upstream if/when they happen).

Fix PATH in Windows dockerfiles.

Use winutils.GetHostPath() on file paths in felix param_types.go.
Add resolving of $env:CONTAINER_SANDBOX_MOUNT_POINT to winutils.GetHostPath().

- clarify HPC env var comments
- add logging when skipping chmod on windows
- fix kubeconfigPath prefix issue