Issue #3593771 - Move the prune revision mechanism from MappedObject into a...

Aaron Baumanrequested to merge
issue/salesforce-3593771:3593771-mapped-object-vid into 6.0.x

Issue #3593771 - Move the prune revision mechanism from MappedObject into a queue-based cleanup mechanism, copying the approach from https://www.drupal.org/project/node_revision_delete

Closes #3593771

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