Device registration e2e test sometimes times out while checking that the device was registered

I've seen `Test device registration during device code flow` fail with

```
TimeoutExpired: Command '['/home/runner/work/authd/authd/e2e-tests/resources/ssh.sh', '--', "sudo find -L /var/snap/authd-msentraid/current -path '*/e2e-test@ubudev1.onmicrosoft.com/token.json'"]' timed out after 30 seconds
```

in step `Check That Device Was Registered`.

Observed in https://authd-e2e-test-logs.adrian-dombeck.workers.dev/push-33891271000/run-33891271000-1/resolute-authd-msentraid/log.html#s1-s11

Start with the `Test device registration during device code flow` e2e test and its `Check That Device Was Registered` step, then inspect `e2e-tests/resources/ssh.sh` and the linked run logs. Determine why the remote `find` command exceeds 30 seconds and make the check reliably complete while still confirming `token.json` exists.

Written by the indexing model from the issue text.