Fix up updating an OverarchingGoal entity

[jhodapp]

Description

This PR ensures that updating an existing OverarchingGoal entity works correctly.

Note: pairs with this frontend PR.

GitHub Issue: None

Changes

• Fix up updating an existing OverarchingGoal entity in the DB
• Use error!() for printing our error types to the console
• Add the inner error reason to the console for better debugging context

Testing Strategy

1. Add an OverarchingGoal using RAPIdoc or the frontend
2. Change the OverarchingGoal in some way and use the PUT endpoint for OverarchingGoal (or the frontend UI) to commit the updates to the DB
3. Inspect the OverarchingGoal in the overarching_goals DB table to validate that it's been updated as expect

Concerns

None