Surface: Using screen size as a default maximum size of Fabric Surface

Summary: That's a temporary change that useful only while we don't have deeper/proper intergration with UIKit's navigation infra.

Reviewed By: mdvacca

Differential Revision: D13104172

fbshipit-source-id: 024e71e04470d56d2c5e9b3f6c3392555ce50b63

React/Fabric/Surface/RCTFabricSurface.mm

@@ -49,7 +49,8 @@
     _rootTag = [RCTAllocateRootViewTag() integerValue];
 
     _minimumSize = CGSizeZero;
-    _maximumSize = CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX);
+    // FIXME: Replace with `_maximumSize = CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX);`.
+    _maximumSize = RCTScreenSize();
 
     _touchHandler = [RCTSurfaceTouchHandler new];