Automatically sync aggragate datasets to AWS

[k1o0]

The current update_aws management command syncs datasets grouped by session and doesn't support aggregate datasets.

• Create method in management command to sync base aggregates folder*
• Create/modify S3 file records for aggregate datasets after sync; delete datasets with only file record on S3
• Skip session level dataset sync when eid is null (here)

*aws s3 sync /mnt/ibl/aggregates s3://ibl-brain-wide-map-private/aggregates --profile ibladmin --exclude *.log --no-progress --dryrun

[oliche]

Filter datasets per empty sessions will give us the set of data to sync.
Then need to go over full architecture to register datasets