[FLINK-7664] Replace FlinkFutureException by java.util.concurrent.CompletionException
FlinkFutureException was introduced to fail a CompletableFuture callback. However, there was already such a class which allows to better handle failures in different stages which is the java.util.CompletionException. Therefore we replace FlinkFutureException by CompletionException and remove the former. This closes #4701.
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