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Make BoardHistoryPager more general-purpose

Description

Make BoardHistoryPager more general-purpose

I plan on using this same class for topic & post too.
Also removed adding the workflow to $this->workflowCache,
because loadMetaDataBatch will currently still fetch it
anyway, regardless of whether it's already in there.

Change-Id: Ie127387232b00323e75d079b60f08dc46c90aec8

Details