CI: Do not set scheduler in qemu-1-setup.sh

We've seen some qemu-1-setup failures while trying to change the
runner's block device scheduler value to 'none':

  We have a single 150GB block device
  Setting up swapspace version 1, size = 16 GiB (17179865088 bytes)
  no label, UUID=7a790bfe-79e5-4e38-b208-9c63fe523294
  tee: '/sys/block/s*/queue/scheduler': No such file or directory

Luckily, we don't need to set the scheduler anymore on modern kernels:
#9778 (comment)

This commit just removes the code that sets the scheduler.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #18437

Author: tonyhutter

.github/workflows/scripts/qemu-1-setup.sh

@@ -149,8 +149,3 @@ echo 1 | sudo tee /sys/module/zfs/parameters/zvol_use_blk_mq
 sudo zpool create -f -o ashift=12 zpool $DISKS -O relatime=off \
   -O atime=off -O xattr=sa -O compression=lz4 -O sync=disabled \
   -O redundant_metadata=none -O mountpoint=/mnt/tests
-
-# no need for some scheduler
-for i in /sys/block/s*/queue/scheduler; do
-  echo "none" | sudo tee $i
-done