Removes a widget element from the stage.
The removeElement() function returns a Promise that is resolved when the element is removed. You can only remove elements that are part of the widget with which the panel is associated.
The element selector is a string with the hash symbol (#) followed by the ID of the item you want to select (for example, "#myElement"). To use this function on an inner (nested) widget, use getScopedWixEditor().
An element selector.