Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  d610f9e3db7a7d4c8cb204b6c3cde41e82ad616a

Instrument the SignupExpCTAButtonClick schema

Also fix a bug in #handleNoThanksForVisualEditor where a second
SignupExpPageLinkClick event would be logged without the user
clicking Edit or Edit source.

Change-Id: I6a2b1fdfde1034daa5ee99e136a054a6af329422