CI: Fix qemu-1-setup failure, remove debug stuff

- For whatever reason, the runner will now startup with either two 75GB
  disks or one 150GB disk.  Previously the runner was always booting
  with two 75GB, but about a quarter of the time it now starts up
  with a single 150GB disk.  This caused qemu-1-setup.sh to fail
  since it expected the two 75GB disks.  This commit updates
  qemu-1-setup.sh to work with either disk config.

- Remove the watchdog from qemu-1-setup.sh.  It didn't turn out to be
  useful.

- Remove the timestamps that zfs-qemu.yml added to the qemu-1-setup.sh
  output.  The timestamps were redundant, since you can already
  download timestamped logs from the Github web interface.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #18166

.github/workflows/zfs-qemu.yml

@@ -88,11 +88,7 @@ jobs:
 
     - name: Setup QEMU
       timeout-minutes: 60
-      run: |
-        # Add a timestamp to each line to debug timeouts
-        while IFS=$'\n' read -r line; do
-            echo "$(date +'%H:%M:%S') $line"
-        done < <(.github/workflows/scripts/qemu-1-setup.sh)
+      run: .github/workflows/scripts/qemu-1-setup.sh
 
     - name: Start build machine
       timeout-minutes: 10