Revert "Remove Platform check from WebSocket module"
Revert "Remove Platform check from WebSocket module"

Summary:
This reverts commit b9be28915cf323eb36f1d7c77821cdf994954074.

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Fix #18696

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Run Jest tests.
Run WebSocket example from RNTester on Android.

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[ANDROID][BUGFIX][WebSocketModule] - revert change that regresses WebSocketModule
Closes https://github.com/facebook/react-native/pull/18733

Differential Revision: D7548850

Pulled By: hramos

fbshipit-source-id: b8c79810c1cd6e5a30ec4118bd5ff8ad719f04b9

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