Summary:
`RCTWebSocketExecutor` saves every WebSocket callback when sending message to chrome, but does not clear them in a debug session until the JS bridge is reloaded, and there may be thousands of blocks saved in the callback table. This PR removes them after they are called.
Closes https://github.com/facebook/react-native/pull/11341
Differential Revision: D4295710
Pulled By: javache
fbshipit-source-id: 29a02d1aba320115bbb97aee8981e34b89303c91
40b84fa5f8