Bulk Editing: Implement "selection state" of the products list

[ealeksandrov]

Description

This task is about enabling a selectable state of the products list view. It contains the following scope:

• custom title and cancel button in the nav bar header Bulk Editing: Add selection state to products list #8563
• ability to select multiple products Bulk Editing: Add selection state to products list #8563
• toolbar in the bottom of the view Bulk Editing: Add bottom toolbar to the products list #8617
• "bulk update" button in the toolbar, enabled conditionally Bulk Editing: Add bottom toolbar to the products list #8617
• popup menu with "status" and "price" options Bulk Editing: Add bottom toolbar to the products list #8617