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Send Parsoid API request immediately when user clicks edit

Authored by Catrope.

Description

Send Parsoid API request immediately when user clicks edit

Move requestPageData from mw.Target to TargetLoader, call it
in init init, and pass the promise it returns into load()
via activate().

Bug: T90372
Change-Id: I828b8474e5a76b3d0d7d08735b4d865c29d2f820