Add related data to file storage file and user actions queries

[apburnes]

When an org manager or user queries a file, they should know who the last user was to update that file. And when an org manager views users actions, the file info should be related to the action.

Acceptance Criteria

• When serializing a file record, it should append the user information to the response with the user who last modified the file
• When serializing a user-action record, it should append the file record related to the user action. For deleted files, make sure to append the soft deleted record.