Writing tables to private groups

[muhanadz]

This PR addresses an issue where an OriginalFile object created during table registration may incorrectly reference an ExternalInfo object owned by another user, rather than the active OMERO user. This generally goes unnoticed in shared groups (Read-Only, Read-Annotate, Read-Write), as read access is permitted across users. However, it leads to a SecurityViolation in private groups, where cross-user access is restricted.

import omero2pandas
db_path = omero2pandas.upload_table("example.csv", "testing", parent_id=123, parent_type="Image")

To resolve this, the change introduces a shallow copy of the OriginalFile using a newly constructed OriginalFileI object. This ensures that ownership and related metadata are correctly set to match the current user context at creation time.

[DavidStirling]

Change is sensible and fixes the problem case in question.