Remove no longer necessary media wiki classes

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Collaboration > Wiki
• Labels:
  • Feb_'19
• Epic/Theme:
  • Technical_Task
• Priority Level: Low
• Sprint: Col | Sprint 7 | Jan22 - Feb1

Since we removed the media wiki plugin there are a bunch of media wiki classes that are no longer needed.