* Add validation to check for existence of dashboard before creation
* add service mock for FindDashboard
* update tests
* reorder function
* update logic change to bool
* update naming validate dashboard
* add tests
* update return val
* remove bool return val
* simplify return statement
* update test
* remove extra spacing
* update mock
* remove unncessary space
* backend/dashboard snapshots: refactor leftover models and mocks
* Move all dashboard snapshot-related models into the dashboardsnapshotservice package
* Remove leftover dashboard-related mocks from the mockstore
Ryan McKinley
Lucy Chen
Ezequiel Victorero
idafurjes
Kristin Laemmert