Remove invariant on nested sibling VirtualizedLists without unique listKey props
Remove invariant on nested sibling VirtualizedLists without unique listKey props

Summary:
It's easy to accidentally trigger this invariant when adding / moving around a component that relies on a FlatList.

There might be some unexpected behavior when this occurs, i.e. messed up virtualization / viewability logging. But to me, that is a better outcome than crashing the JS context.

Reviewed By: sahrens

Differential Revision: D14975295

fbshipit-source-id: 18015a780a153aae995723b120440be0e55d8e8b

janicduplessis/react-native,hammerandchisel/react-native,pandiaraj44/react-native,janicduplessis/react-native,hoangpham95/react-native,hammerandchisel/react-native,arthuralee/react-native,exponentjs/react-native,pandiaraj44/react-native,exponentjs/react-native,javache/react-native,exponent/react-native,facebook/react-native,hoangpham95/react-native,exponentjs/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,exponentjs/react-native,facebook/react-native,myntra/react-native,exponent/react-native,janicduplessis/react-native,arthuralee/react-native,myntra/react-native,exponent/react-native,javache/react-native,exponentjs/react-native,hoangpham95/react-native,myntra/react-native,javache/react-native,hoangpham95/react-native,hammerandchisel/react-native,exponent/react-native,myntra/react-native,hoangpham95/react-native,exponent/react-native,janicduplessis/react-native,arthuralee/react-native,myntra/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,javache/react-native,exponentjs/react-native,facebook/react-native,hoangpham95/react-native,arthuralee/react-native,arthuralee/react-native,facebook/react-native,pandiaraj44/react-native,janicduplessis/react-native,facebook/react-native,pandiaraj44/react-native,hammerandchisel/react-native,exponentjs/react-native,facebook/react-native,facebook/react-native,exponent/react-native,myntra/react-native,hammerandchisel/react-native,hammerandchisel/react-native,javache/react-native,hoangpham95/react-native,hoangpham95/react-native,pandiaraj44/react-native,hammerandchisel/react-native,exponentjs/react-native,javache/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,exponent/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,hammerandchisel/react-native,pandiaraj44/react-native,exponent/react-native