Add slot to WorkflowExecution and DataObject classes to point to newer versions of associated WorkflowExecution

[kheal]

This PR

• Adds slot superseded_by to the schema
• Adds the slot superseded_by to WorkflowExecution and DataObject classes
• Constrains the range of superseded_by to the specific type of WorkflowExecution subclass
• Adds example valid and invalid data
• Closes Add slot to WorkflowExecution and DataObject classes to point to newer versions of associated WorkflowExecution and DataObject #2693

[github-actions]

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[aclum]

I'd like to discuss DataObjects referring to a newer WorkflowExecution instead of or in addition to individual DataObjects over time mostly because workflow outputs can change over time there may not be 1:1 of the replacement files and or may involve increasingly complicated logic whereas the WorkflowExecution subclasses are more stable over time.

Tagging @eecavanna and @shreddd because this will need to be coordinated with corresponding changes to referential integrity checks in nmdc-runtime. If there is a newer version and something goes wrong and that version needs to be deleted the reference to that needs to be removed.

[kheal]

@aclum Now this slot only references the newer WorkflowExecution that makes the records "outdated". I think this is much cleaner and more maintainable, thanks for the feedback.

[aclum]

Looks great