Remove testID from TS ViewStyle

Summary:
testID isn't a valid prop to exist on a style.

Changelog:
[General][Fixed] - Remove testID from TS ViewStyle

Reviewed By: necolas

Differential Revision: D42040627

fbshipit-source-id: d51b0dc7abff14ac72f71753ea1ae708e0858590

Libraries/StyleSheet/StyleSheetTypes.d.ts

@@ -248,7 +248,6 @@ export interface ViewStyle extends FlexStyle, ShadowStyleIOS, TransformsStyle {
   borderTopWidth?: number | undefined;
   borderWidth?: number | undefined;
   opacity?: number | undefined;
-  testID?: string | undefined;
   /**
    * Sets the elevation of a view, using Android's underlying
    * [elevation API](https://developer.android.com/training/material/shadows-clipping.html#Elevation).