ZTS: Apply small changes for speeding up the tests

The Github Action Runner got some new hardware metrics.  We should use
the provided and empty disk which is pre-mounted at /mnt now.

Disk1: 89GiB -> rootfs + bootfs with ~80MB/s -> don't care
Disk2: 64GiB -> /mnt with 420MB/s -> new testing ssd

This commit will mount the new disk to /var/tmp and provide hopefully
some speedups within our testings.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Andrew Innes <[email protected]>
Signed-off-by: Tino Reichardt <[email protected]>
Closes #15811 

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