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Skip registering RL modules depending on VisualEditor

Description

Skip registering RL modules depending on VisualEditor

When VisualEditor is not installed, there is no point in registered
resource loader modules that depends on it. A use case is trying to run
tests for the MediaWiki tarball. It comes with Cite but without
VisualEditor.

The patch is based on GuidedTour patch by Matthew Flaschen
https://gerrit.wikimedia.org/r/#/c/305691/ for T143297

Change-Id: Idf769e0149f93c099a94b1b7a6cb203273dab881