Model files should be updated to reflect recent discussions about assessments feature

[seidior]

Describe the Feature / Enhancement

Different tickets have been updating the models files for both api and webapp. It would save a lot of time and effort for these changes to be merged into the feature and synchronized so that the same types are available for both frontend and backend tickets.

Additional Details and Resources

The following changes will need to be made:

• SubmittedAssessment and OpenedAssessment should collapse into one SavedAssessment type.
• There should be a base, non-exported interface called Assessment from which the different similar types (AssessmentWithSummary, SavedAssessment, and AssessmentWithSubmissions) inherit.
  • This inherited interface should also include a new member, principal_program_role, that responds with either "participant" or "facilitator", the role of that user for the program associated with that Assessment.
• submissions_summary inside of AssessmentWithSummary should be broken into participant_submissions_summary and facilitator_submissions_summary to reduce ambiguity.
• most_recent_submitted_date in AssessmentSubmissionsSummary should be made optional.
• All database entity types should inherit from Entity on the frontend.

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