Improve UX on how editors should handle Drafts. This improvement is linked to EZP-31223.

Suggested solution based on user testing results, users consider the current Delete draft button as a "Discard" button, given that in other part of our UI that button uses the same icon:

• In content section, editing view, change ez-context-menu's icon for Delete draft (currently circle-close) to trash-empty. New icon is part of ez-icons.svg file (available in ezplatform-admin-ui/src/bundle/Resources/public/img)

Image attached with suggested change "1_Change_Delete_Draft_icon.png".

 
Apply also this change for the Delete draft icon button in Site Builder Editing view due to consistency purposes.
Attached image of current icon in Site Builder "eZ Platform (18).png"

Along with this change in Site Builder editing bar (ez-page-builder-right-sidebar), apply also box-shadow property. Suggested:

box-shadow: calculateRem(-4px) 0 calculateRem(6px) 0 rgba(135, 135, 135, 0.35);