helm: lava-server: Add periodic TestJob cleanup
CronJob added by this patch will be run on Sunday midnight and will remove all TestJobs older than 90 days by default.
In order not to start multiple job removal tasks at once running this CronJob cuncurrently was explicitly forbidden (even though such case is unlikely - removal would have to take longer than subsequent CronJob schedules).
Signed-off-by: Paweł Wieczorek pawiecz@collabora.com