[REF] [EXPORT] Stop passing return Properties

[eileenmcnaughton]

Overview

Minor code cleanup on the export task

Before

Code less logical

After

Code more logical

Technical Details

Moves us more towards having the processor class doing 'the stuff' - rather than passing around arrays

Comments

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).