Fix a few async-related bugs with archive jobs

[araglu]

• Move ensure_connected decorator to _update_status() which avoids connecting to HPCs for every update, even the ones that didn't need it like Completed status.
• Change archive_dir from property to an async function.
• Avoids this error: jobs_table:287 update_row(): You cannot call this from an async context.
• Avoids this error when restoring an archived job: jobs_table:108 perform_action(): You cannot call this from an async context. It also failed to add the restored job back to the main jobs table.
• Move database_sync_to_async from a decorator on instance_from_pbs_job() over to a function inside async areas. This change allows for calls to instance_from_pbs_job() from sync functions.
• I think @sdc50 already fixed the missing commands variable, but it is fixed here as well.
• Sets the job status from Complete to COM on the restored job. Without that, it kept appearing as a Pending job.

I'm not sure if these fixes are the best approach with async code. If the change to the decorator on instance_from_pbs_job() goes through, I also have to change one reference to it in another repo (load_previous_jobs).

CHW-673