Add cypress tests for dataset management

[allisonking]

Is your feature request related to a specific problem?

We need tests for dataset management!

Describe the solution you'd like

We should add Cypress tests to test out all of the routes and user interactions of dataset management.

Describe alternatives you've considered, if any

Just unit tests, but these tend not to be as useful for user interactions like this. Since our components are fairly simple (mostly tables), but our data routing/user interactions are more complex, Cypress is best suited for this.

Additional context

Blocked by https://github.com/ethyca/fidesui/issues/5

[allisonking]

We should have tests for:

• List view of datasets
• List view of dataset fields
• Editing a dataset field
• Editing a dataset collection
• Editing a dataset
• Deleting a dataset
• Deleting a dataset collection
• Deleting a dataset field
• Checkbox behavior for data categories
• Creating a dataset via yaml
• Creating a dataset via database connection

[allisonking]

Going to split out the two "creates" into their own ticket, since that work is still in progress.