Force WithDefault not to be an optional value

Summary:
`WithDefault` appears not to be required to be prefixed with `?` because it's option value per se.

Fixed tests, removed `?` where needed, updated snapshots and review them. Added mechanism fro throwing error when `?WithDefault` found. Add tests for it.

Reviewed By: rubennorte

Differential Revision: D16048463

fbshipit-source-id: f55ed7454aacf0b8c42944a9b5c1037ad1b360fe

Libraries/Components/ProgressViewIOS/RCTProgressViewNativeComponent.js

@@ -21,8 +21,8 @@ type NativeProps = $ReadOnly<{|
   ...ViewProps,
 
   // Props
-  progressViewStyle?: ?WithDefault<'default' | 'bar', 'default'>,
-  progress?: ?WithDefault<Float, 0>,
+  progressViewStyle?: WithDefault<'default' | 'bar', 'default'>,
+  progress?: WithDefault<Float, 0>,
   progressTintColor?: ?ColorValue,
   trackTintColor?: ?ColorValue,
   progressImage?: ?ImageSource,