Don't fail when destroyContainerFS is called more than once
Don't fail when destroyContainerFS is called more than once

This can happen when destroy is called multiple times or when destroy
failed previously and is being called again.

PiperOrigin-RevId: 221882034
Change-Id: I8d069af19cf66c4e2419bdf0d4b789c5def8d19e

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor