[IMP] website, *: combine first dropzone and editor messages

* web_editor

When starting a drag and drop in the editor, a series of dropzones
appear to indicate to the user where he can drop the block being
dragged. In the website editor, when an editable structure is empty,
it is filled with a message to indicate we can drag and drop something
in there. The problem was that this message and the design that comes
with it disappeared when starting a drag and drop as it was replaced by
the editor dropzones. Now, the 2 are combined: when a dropzone appears
in an empty editable structure, the message and its design are kept and
just changes color and animation to match the one of an editor dropzone.

Part of https://github.com/odoo/odoo/pull/36515
task-2057320

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