Map Gemma 2.0 audit event types for shared-trail read compatibility

[ppavlidis]

Problem

Gemma 2.0 (frink) and the 1.x line share one audit trail in the production database. 2.0 emits 21 AuditEventType subclasses whose discriminators the 1.x Hibernate mapping doesn't know, so 1.x throws org.hibernate.WrongClassException when it loads a dataset whose trail contains one.

Live example: DesignChangeEvent (from the composite curation commit) broke the experiment page for GSE16035 (id 25717):

org.hibernate.WrongClassException: Object with id: 1048541 was not of the specified subclass:
ubic.gemma.model.common.auditAndSecurity.eventType.AuditEventType (Discriminator: DesignChangeEvent)

Fix

Add read-compatibility marker classes plus AuditEventType.hbm.xml <subclass> entries for the 21 discriminators, so the 1.x line resolves them on read.

• 1.x never writes these; they carry no data — they exist only so the read succeeds.
• Each is flattened onto an existing mapped parent (2.0's real hierarchy has extra abstract intermediates that aren't needed just to read a row).
• AggregatedSingleDataAddedEvent already existed unmapped — it only needed the hbm entry (the class file is untouched).

Scope is exactly {discriminator values 2.0 writes} − {values the 1.x hbm already maps} (the Preferred*Changed types were already covered because 1.x maps their older Change-spelled discriminator values).

Discriminators mapped (21)

DesignChangeEvent, TagAddedEvent, TagRemovedEvent, AnnotationSetEvent, AggregatedSingleDataAddedEvent, DatasetPublishedEvent, DatasetShortNameChangedEvent, PipelineRunEvent, FailedPipelineRunEvent, PipelineBatchCancelledEvent, PipelineBatchClosedEvent, PipelineBatchSubmittedEvent, PreboardedCreatedEvent, PreboardedPromotedEvent, TicketOpenedEvent, TicketAssignedEvent, TicketStateChangedEvent, TicketMetadataChangedEvent, TicketTargetStatusChangedEvent, VectorsReorderedEvent, WorkflowStateChangedEvent.

Validation

• XML well-formed (xmllint); every new discriminator has a matching class file; all parents resolve.
• Separately, orphaned AgentProposalEvent rows in prod (from the retired skeleton/agent branch — mapped by neither 1.x nor 2.0) were cleaned up directly; those are deliberately not ported.

Base branch

Targets hotfix-1.32.8 (unreleased next patch), not the released hotfix-1.32.7.