feat(livemode, stratis): support stratis storage in live mode

[MichalHe]

This is a draft PR that collects results of my investigations of what would be needed to support stratis filesystems during the upgrade. It is far from being done.

Add support for mounting stratis storage which requires the stratisd.service to be running in order to mount the filesystems. It is sufficient to make sure that the stratisd daemon is available in the squashfs image - fstab entries will request its start.

[github-actions]

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