gpt-auto-generator on usr-only root in presence of sysexts (#43591)
This adds a fallback to `blockdev_get_root`, to handle the case where `/usr` is a sysext overlay. Additinal changes are: - move `extension_overlay_block` to `extension-util.h`, and make it generic to work in both confext and sysext cases (though only sysext is actually used currently) - add a usr-only integration test to exercise the failure Closes #43565.
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