lava: Error when job submission fails

By moving the status check on the lava job submission call from the
after_script section to the script section it will fail the job correctly
if lava rejects the submitted job.
Rather than having to copy the whole script section in jobs that wish to
dynamically create the test file the entire job submission and check can
be included using the !reference GitLab yaml include.

Changelog: other
Signed-off-by: Drew Reed <Drew.Reed@arm.com>