Make getContextualTypeOfApparentType mapType over unions (#17668)

* Instantiate contextual types while in an inferrential context

* Limit scope of instantiation to only when likely needed

* Still get aparent type

* Expand test

* Fix nit

* Handle JSX and array

* Tests for the JSX and Array cases

* After much deliberation and inspection, much simpler fix

After much deliberation and inspection, much simpler fix

Undo

Redo

src/compiler/checker.ts

@@ -13691,7 +13691,7 @@ namespace ts {
         // be "pushed" onto a node using the contextualType property.
         function getApparentTypeOfContextualType(node: Expression): Type {
             const type = getContextualType(node);
-            return type && getApparentType(type);
+            return type && mapType(type, getApparentType);
         }
 
         /**