Fix nested children

[Bloomca]

Description

Fix nested children problem. If we had something like:

   function Wrapper({ children }) {
     return (
       <>
         {children}
         <ConfirmationRenderer />
       </>
     );
   }

This resolves to:

   [
     [<Component1 />, <Component2 />],
     <ConfirmationRenderer />,
   ]

We called Array.isArray(children) ? children : [children] before. It worked because JSX is smart enough to ditch an array if it is a single child, but with multiple children it does not work.