Need to rationalize the Windows paths across the project

@dkoshkin Makes sense. That in combination with using capi's kubeadmconfig as mentioned in https://github.com/kubernetes-sigs/image-builder/issues/709#issuecomment-948373697 make it easy to customize.

If you can update the windows part to `/containerd` to `\\\\containerd` here https://github.com/kubernetes-sigs/image-builder/pull/711#discussion_r729910223 I think we are good to go! @perithompson and I will looking to normalizing the paths across all the Windows parts in a follow up.

_Originally posted by @jsturtevant in https://github.com/kubernetes-sigs/image-builder/issues/711#issuecomment-948776390_

Start by locating the Windows-specific parts of the image-builder project and inventorying the path conventions they use. Compare those paths with the normalization requested in the issue and its linked discussion; done means the Windows paths are consistent across the project.

Written by the indexing model from the issue text.