Performance tweaks and fixes to onNewRevisionFromEditComplete
Performance tweaks and fixes to onNewRevisionFromEditComplete

* Defer most of the work to post-send
* Fixed the redirect check to actually work, as isRedirect() no longer
  takes a content text argument

Change-Id: I238711d9ee4ad603dc20e5cc2a144079d274bc33

wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage