grpc-js: Throw in watchConnectivityState if channel is closed #1714
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Channel#waitForReadyexpects this error to be thrown (https://github.com/grpc/grpc-node/blob/master/packages/grpc-js/src/client.ts#L178-L186). This is the same error that is thrown byChannel#createCallif the channel is closed.This was discovered because of someone noting in googleapis/nodejs-pubsub#1190 (comment) that the
watchConnectivityStatetimer can keep the process running even after the channel is closed.