refactor: align ReactNativeViewConfigRegistry flow typing (facebook#27514)

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## Summary

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aligned the typing for `ReactNativeViewConfigRegistry` in
`react-native-host-hooks.js`
continuation of facebook#27508

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Author: jbroma

scripts/flow/react-native-host-hooks.js

@@ -134,7 +134,6 @@ declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface'
   declare export var ReactNativeViewConfigRegistry: {
     customBubblingEventTypes: Object,
     customDirectEventTypes: Object,
-    eventTypes: Object,
 
     register: (name: string, callback: __ViewConfigGetter) => string,
     get: (name: string) => __ReactNativeBaseComponentViewConfig,