Purge batch process

The Purge batch process purges jobs and prunes policy periods that meet the purge and prune criteria.

Jobs for which all of the following apply are placed into the Purge work queue:

Condition	Configurable in Purge plugin?	Configurable in config.xml?
Job subtype is allowed for purging or pruning. The batch process calls the following property getters in the `PurgePlugin` plugin interface: `AllowedJobSubtypesForPurging`	•
The `Job` is closed, and the `CloseDate` is at least `PurgeJobsRecentJobCompletionDays` or `PruneVersionsRecentJobCompletionDays` in the past.
The `NextPurgeCheckDate` on the job has passed.
The `PurgeStatus` has a value other than `NoActionRequired`.