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Move timing.MediaWiki.echo.overlay stats into ext.echo.init

Authored by Legoktm.

Description

Move timing.MediaWiki.echo.overlay stats into ext.echo.init

We really only care about measuring the timing of the first click,
because that is the one that loads OOjs UI and fires an API request.

Bug: T113387
Change-Id: Ib37d31b07c45d546c75251a57a848e3ae0f4bf1b