Fix error case in Windows layer cleanup
Fix error case in Windows layer cleanup

ForceRemoveAll has special logic on Windows for cleaning up a Windows
snapshotter directory. The logic was missing proper handling for an
error case that can be returned in some cases.

This fixes the CI failure seen in #5326.

Signed-off-by: Kevin Parsons <179e5f33d278e7f4e6411489dacfa9a734384f98@microsoft.com>

containerd/containerd,estesp/containerd,containerd/containerd,mikebrow/containerd,dmcgowan/containerd,thaJeztah/containerd,thaJeztah/containerd,dmcgowan/containerd,mikebrow/containerd,estesp/containerd