Run rebuildEntityPerPage.php on Wikidata (once per week)

This is needed as we from time to time have slight inconsistencies
in that table, thus it should be sanity tested and fixed every week.
I ran this script per hand on Wikidata a bit back without any troubles
(and it was quite fast, as it only adds missing rows).

Change-Id: I6e65c5da1b2eb47bfad25f21b156becd0536040a
Merge "Run rebuildEntityPerPage.php on Wikidata (once per week)" into production