[IMPR] transferbot: link to history subpage from summary
[IMPR] transferbot: link to history subpage from summary

Two cases for the /edithistory subpage link:
-if target page namespace allows subpages, we can create an implicit link [[/subpage]]
-else we need to copy the full page prefix title like [[page/subpage]]

Bug: T166516
Change-Id: I6aae0279b09aa0627685add0b1b3fd1ce92807f9

PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core,wikimedia/pywikibot-core