Remodel class that aggregates steps of `WorkflowExecution` for easier schema traversal

[kheal]

Although we've decided to remove the WorkflowChain class, having a class that holds several steps of WorkflowExecution to mirror the current ProtocolExecution class for easier schema searching/traversing would be very useful. The name of this class is TBD.

Proposed slots

• has_process_parts with range of WorkflowExecution (this reverses the parthood between WorkflowExecution and WorkflowChain)
• analyte_category with range of AnalyteCategoryEnum
• has_input with range of DataObject (representing the output of a DataGeneration process)
• has_input with range of DataObject (representing the processed data object(s))

@aclum @brynnz22 @mbthornton-lbl <- Open to others' inputs to the modelling of this class.

[aclum]

When we remodel this we should include these slots which current don't have a home. We could put this on the individual WorkflowExecution subclasses but it would be redundant info across multiple classes. gold_analysis_project_identifiers:

• gold:Ga0083920 jgi_portal_analysis_project_identifiers:
• jgi.analysis:1023687