API Refactor SiteTree filtering to work like GridField filters #3052
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CMSMain uses an entirely separate code path for building the filter form and for the actual filter functionality compared with the gridfield filter used literally everywhere else in the CMS.
This aims to unify the two as much as possible, so that filtering pages in CMSMain is the same as filtering everywhere else.
It also generalises it which will help to unlock #2951
Issue
CMSMain
/HierarchyModelAdmin
#2949