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Remove Special:GettingStarted and notifications

Description

Remove Special:GettingStarted and notifications

  • Productize test version from OB6
  • Remove all references to the special page
  • Remove all Echo notifications
  • Change GettingStarted to be officially an API extension
  • Remove dead code and minor fm

Bug: 54993
Bug: 54362
Bug: 48868

Change-Id: Iab6b347c6e3b1810291e2f8206fc2534dc787d02