[hyperv][gui] Daemon indefinitely waits for SSH to be up.

Describe the bug With the old hyperv driver, whenever a VM is being started or launched from the GUI, the daemon starts waiting super long. In the logs, I see: [whatever-vm] Waiting for SSH to be up. Any subsequent calls to multipass will stay on hold.

To get out of this, I usually need to kill the daemon. And once restarted, the new VM appears as running. Note that this occurs only with hyperv driver (the old one). With hyperv_api, there are problems too, but different.

To Reproduce How, and what happened?

1. Open the multipass GUI, and:
2. launch an ubuntu 26 VM.
3. or start an existing VM.
4. Wait 5 mins, nothing happens...

Expected behavior The daemon should be able to finish its work.

Logs Please provide logs from the daemon, see Access logs on where to find them on your platform.

Additional info

• OS: Win 11 Pro
• CPU architecture or model: x64
• multipass version 1.17.0-dev.ci6331+ga58dcf2e.win
• multipass get local.driver hyperv

Additional context It seems like this occurs more (only?) when the GUI is open.