[Improve][e2e] Remove duplicate dependencies (#8628)

Author: wuchunfu

Diff for: seatunnel-e2e/seatunnel-connector-v2-e2e/connector-kafka-e2e/pom.xml

@@ -115,11 +115,6 @@
             <version>${testcontainer.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>mysql</groupId>
-            <artifactId>mysql-connector-java</artifactId>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 
 </project>