Update ExtensionConfigurations to generate for clients only (#911)

Author: Steven Yuan

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/DirectedTypeScriptCodegen.java

@@ -437,14 +437,12 @@ public void customizeBeforeIntegrations(
                 LOGGER.fine("Generating " + target + " runtime configuration");
                 configGenerator.generate(target);
             }
+            new ExtensionConfigurationGenerator(directive.model(), directive.service(), directive.symbolProvider(),
+                    directive.context().writerDelegator(), directive.context().integrations()).generate();
+            new RuntimeExtensionsGenerator(directive.model(), directive.service(), directive.symbolProvider(),
+                    directive.context().writerDelegator(), directive.context().integrations()).generate();
         }
 
-        new ExtensionConfigurationGenerator(directive.model(), directive.service(), directive.symbolProvider(),
-                directive.context().writerDelegator(), directive.context().integrations()).generate();
-
-        new RuntimeExtensionsGenerator(directive.model(), directive.service(), directive.symbolProvider(),
-                directive.context().writerDelegator(), directive.context().integrations()).generate();
-
         // Generate index for client.
         BiConsumer<String, Consumer<TypeScriptWriter>> writerFactory =
             directive.context().writerDelegator()::useFileWriter;