Exclude non-personal, non-globus endpoints from local file record delete

[k1o0]

Deleting large local files on the Steinmetz server failed with the following error:

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ubuntu/alyxvenv/lib/python3.8/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "/home/ubuntu/alyxvenv/lib/python3.8/site-packages/django/core/management/__init__.py", line 440, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/ubuntu/alyxvenv/lib/python3.8/site-packages/django/core/management/base.py", line 402, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/ubuntu/alyxvenv/lib/python3.8/site-packages/django/core/management/base.py", line 448, in execute
    output = self.handle(*args, **options)
  File "/var/www/alyx-main/alyx/data/management/commands/files.py", line 151, in handle
    transfers.globus_delete_local_datasets(dsets, dry=dry)
  File "/var/www/alyx-main/alyx/data/transfers.py", line 676, in globus_delete_local_datasets
    delete_clients.append(globus_sdk.DeleteData(gtc, ge, label=label))
  File "/home/ubuntu/alyxvenv/lib/python3.8/site-packages/globus_sdk/services/transfer/data/delete_data.py", line 118, in __init__
    raise exc.GlobusSDKUsageError("endpoint is required")
globus_sdk.exc.base.GlobusSDKUsageError: endpoint is required

This issue is that the file records associated with the input datasets include those on AWS where the data repository Globus endpoint ID is null. The key change here was adding a filter for globus_is_personal=True, and globus_endpoint_id__isnull=True.

I am surprised this error has not been reported before and hence would like a review before merging. I couldn't locate a recent change that would have caused a regression.

[oliche]

As per our discussion.
Thanks !