Restyling of Publish button animation in the visual editor

When a document's changes are saved in the channel manager, the Save button changes into a Publish button. To make users notice that change, the button is animated

current animation: background change to orange (and back to transparent).

required change: instead of orange, use primary blue (#147AC8)

Note that CMS-12727 must be fixed first: In the restyled visual editor, the Save button should be a primary outlined button