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Add XAnalytics MediaWiki extension and make WikimediaEvents require it

Description

Add XAnalytics MediaWiki extension and make WikimediaEvents require it

In order to fully test WikimediaEvents locally (or test its integration
with other software), its XAnalyticsSetHeader hook listener must
be triggered by the XAnalytics extension.

See T97104.

Change-Id: I7904afbe8f67dfce7678a328ac05d9f0e9db3fa1

Details