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feat(scripts): add up/down state checking to `wait_for_ssh`

The `wait_for_ssh` script previously only checked whether the target was
*up*. This could cause false positives during reboots, since a rebooting
target might still appear as reachable at the time of the check.

To improve reliability:

- The script can now check for both *up* and *down* states.
- A raw socket probe is used instead of Paramiko to avoid hangs.

Signed-off-by: Simon A. F. Lund <os@safl.dk>

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