Story 59: User sees warning when deleting image if it's used on storefront

[tkacheva]

Story

As a Merchant I want to see a warning that image I delete is used on storefront so that I don't accidentally corrupt storefront content

Business Value

no broken content due to accidentally removed asset

Preconditions

• Admin User is logged into Admin Panel
• Admin User views images in Media Gallery

Acceptance Criteria

• User selects image and start deleting it.
• USer sees a warning message, if image is used somewhere on storefront. Warning message communicates how many times the asset is used in catalog, content and marketing areas. User has option to view and manage the asset usage before deleting it. I
• User confirms deleting the asset, asset and all its renditions removed from media storage and DB records

[sivaschenko]

Single task: check if image is used on attempt to delete an image and show the usage in the warning

• New request to the server before deletion confirmation
• Controller and model
• Support multiple image deletion