Refactor `AbstractSimpleTransportTestCase` and `MockTransportService` to not use `Version.transportVersion` 
test/framework/src/main/java/org/elasticsearch/transport/AbstractSimpleTransportTestCase.java
@Override
                public Version1Response read(StreamInput in) throws IOException {
                    return new Version1Response(in);
                }
                @Override
                public void handleResponse(Version1Response response) {
                    assertThat(response.value1, equalTo(1));
                    assertThat(response.value2, equalTo(2));
                }
                @Override
                public void handleException(TransportException exp) {
                    logger.error("Unexpected failure", exp);
                    fail("got exception instead of a response: " + exp.getMessage());
                }
            }
        ).get();
        assertThat(version1Response.value1, equalTo(1));
        assertThat(version1Response.value2, equalTo(2));
    }
    public void testVersionFrom0to0() throws Exception {
        serviceA.registerRequestHandler("internal:version", ThreadPool.Names.SAME, Version0Request::new, (request, channel, task) -> {
            assertThat(request.value1, equalTo(1));
            Version0Response response = new Version0Response(1);
            channel.sendResponse(response);
            
            assertThat(channel, instanceOf(TaskTransportChannel.class));
            assertThat(((TaskTransportChannel) channel).getChannel(), instanceOf(TransportService.DirectResponseChannel.class));
        });
        Version0Request version0Request = new Version0Request();
        version0Request.value1 = 1;