bugfix: fix thread synchronization and add some complex parallel tests (#284)

* Add parallel complex tests

* fix thread synchronization

---------

Co-authored-by: Alex Wang <wangyb@amazon.com>
Co-authored-by: Frank Chen <frankchn@amazon.com>

Author: 3 people

sdk-integration-tests/pom.xml

@@ -41,6 +41,12 @@
             <artifactId>junit-jupiter</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>${slf4j.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>