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Added ObjectCache::getMainStashInstance() and $wgMainStash

Authored by aaron.

Description

Added ObjectCache::getMainStashInstance() and $wgMainStash

  • This provides factory/config more appropriate for stashes
  • Cleaned up some neighboring config comments while at it

Bug: T88493
Bug: T97620
Change-Id: Id370ee50be6e493a4700c858df863a183abc05fd