executor: cleanup mounts with MNT_FORCE

Starting from v6.9, we can no longer reuse a loop device while some
filesystem is mounted on it. It conflicts with the MNT_DETACH approach
we were previously using.

Let's umount synchronously instead, but also with a MNT_FORCE flag to
abort potentially long graceful cleanup operations. We don't need them
for the filesystems mounted only for fuzzing purposes.

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