PersistentDataModel, etc: Add dhFormToken to DataHeader.

Track the DhForm token in the transient DataHeader. This is to allow skipping the key registration step if the format has not changed.

This merge request affects 3 packages:

• Database/AthenaPOOL/EventSelectorAthenaPool
• Database/PersistentDataModel
• Database/PersistentDataModelTPCnv

Affected files list will not be printed in this case

Adding @amete ,@gemmeren ,@tadej ,@maszyman ,@mnowak ,@ssnyder as watchers

added Database main review-pending-level-1 labels

added full-build label

removed full-build label

added full-integration-tests full-unit-tests labels

CI Result SUCCESS (hash 211ca57d)

	Athena	AthSimulation	AthGeneration	AthAnalysis
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output (remote access info)

Changes are fine and CI succeeds, approving for L1. -L1

added review-approved label and removed review-pending-level-1 label

Thanks @ssnyder. Let me also tag @mnowak as our DH expert.

I have not come across "EventSelectorAthenaPoolUtil::registerKeys()" before, so I am not feeling very expert on this one

merged

mentioned in commit 21036a0b