restore compatability for older versions

3244.vf7f977e04755 requires the agent to be upgraded in lockstep with
Jenkins to avoid remoting errors such as:

java.lang.IllegalStateException: Unable to call getName. No matching method found in [interface hudson.remoting.RemoteClassLoader$IClassLoader] for hudson.remoting.RemoteClassLoader$ClassLoaderProxy@2cdf8d8a[jdk.internal.loader.ClassLoaders$AppClassLoader@2cdf8d8a]

This restores the compatability by specifically handling a method call
to getName for the IClassLoader and returning a dummy value if the
remote version is older than 3244

src/main/java/hudson/remoting/RemoteInvocationHandler.java

@@ -916,8 +916,16 @@ protected Serializable perform(@NonNull Channel channel) throws Throwable {
             Class<?>[] clazz = channel.getExportedTypes(oid);
             try {
                 Method m = choose(clazz);
-                if(m==null)
+                if(m==null) {
+                    // TODO this workaround can be deleted when Jenkins minimum remoting version > 3244.vf7f977e04755
+                    // https://github.com/jenkinsci/jenkins/blob/bcb5ed8f2218208b11b029d023a70bc7c0851418/pom.xml#L92C5-L92C40
+                    if ("hudson.remoting.RemoteClassLoader$IClassLoader".equals(declaringClassName) && "getName".equals(methodName)) {
+                        // the other side does not have #741
+                        // there's no name and the return is a String.  Return something
+                        return "upgrade-remoting-to-3244.vf7f977e04755-or-higher";
+                    }
                     throw new IllegalStateException("Unable to call " + methodName + ". No matching method found in " + Arrays.toString(clazz) + " for " + o);
+                }
                 m.setAccessible(true);  // in case the class is not public
                 Object r;
                 try {