Write a function that returns returns tape name and object store name

[nmassey001]

Currently the code "munges" the name of the file to get the tape path and object store path in multiple places.
It would be much better if we could write a function that does this munging so there is no chance of making a mistake in the code.

e.g.:

          holding_tape_path = (f"root://{tape_server}/{tape_base_dir}/"
                                 f"{holding_slug}")
          full_tape_path = (f"{holding_tape_path}/{tar_filename}")

and:

            bucket_name, object_name = (
                   path_details.object_name.split(':')
            )

and even worse in the delete code router (my doing)!

[nmassey001]

• object name function
• tape name function
• use in put_transfer
• use in get_transfer
• use in del_transfer
• use in archive_put
• use in archive_get