lava_scheduler_app: Remove unused `parse_job_description` function
Does not seems to be used anywhere.
$ rg 'parse_job_description' lava_scheduler_app/dbutils.py 123:def parse_job_description(job):
Git history shows that it was last used in
that was removed in 2020.
$ git log --oneline -S 'parse_job_description' 9f4c6df5f Replace lava-master and lava-logs by lava-scheduler bfaf8f2c4 master: don't generate the description
parse_job_description was first added.
9f4c6df5 the command that used
parse_job_description was removed.