[TAP] Allow creation of PENDING jobs ONLY FROM the TAPFactory when the service...

[TAP] Allow creation of PENDING jobs ONLY FROM the TAPFactory when the service is unavailable. Before this modification, the backup manager could not restore jobs at the service starting. When the service is said unavailable, the resources /sync and /async are rejecting HTTP requests, but jobs can be created and started in background (very useful for backup restoration but also for queued jobs).