Cleaning up some code leftover from the Preservation-Access Split project.

[RussellMcOrmond]

• https://github.com/crkn-rcdr/cihm-metadatabus/issues/78
• https://github.com/crkn-rcdr/cihm-metadatabus/issues/70
• Remove code that looked for "path" field, which was a path into Preservation storage rather than Access storage.
  • Several completed tasks in https://github.com/orgs/crkn-rcdr/projects/4/views/1

[RussellMcOrmond]

Quick suggestion: you may want to merge this PR which I opened, and open a separate one. That way I won't get notifications on updates.

Thank you!