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ve.init.mw.TargetLoader: Error when RESTbase load call fails

Authored by Krenair.

Description

ve.init.mw.TargetLoader: Error when RESTbase load call fails

No retry right now, but we should at least stop failing silently. Doing this
in a window.alert() for now, as OOUI isn't available at this part of the
page load just yet (that will be coming soon).

Bug: T97041
Change-Id: Iacb195667215ee69d3991e4c41651ab6042243c5