USER STORY: Change product detail error notifications

[johnamdickson]

Epic: Notification System #28

User Story: As a product developer I can change product detail empty select notification from toasts to popovers so that the clients preference based on interim feedback can be delivered.

Acceptance Criteria:

• An error popover for input groups when no selection has been made and the add to cart button is clicked.
• Client agreement on the change.

Tasks:

• [x] Remove toasts from product detail page for errors on add to cart.
• [x] Add popovers in place of toasts.
• [x] Consult with client to confirm preference for new notification type on product detail page.

[johnamdickson]

Toasts removed and replaced with popovers for unselected product detail page inputs. Changes agreed with client.