[FLINK-25868][build] Disable japicmp in packaging/e2e modules

Optimize build times and reduce noise (warnings would be printed as these modules are not being deployed, so the previous versions can not be found).
diff --git a/flink-sql-connector-elasticsearch6/pom.xml b/flink-sql-connector-elasticsearch6/pom.xml
index 767afa4..14f35d6 100644
--- a/flink-sql-connector-elasticsearch6/pom.xml
+++ b/flink-sql-connector-elasticsearch6/pom.xml
@@ -34,6 +34,10 @@
 
 	<packaging>jar</packaging>
 
+	<properties>
+		<japicmp.skip>true</japicmp.skip>
+	</properties>
+
 	<dependencies>
 		<dependency>
 			<groupId>org.apache.flink</groupId>
diff --git a/flink-sql-connector-elasticsearch7/pom.xml b/flink-sql-connector-elasticsearch7/pom.xml
index 8f62364..43a42dc 100644
--- a/flink-sql-connector-elasticsearch7/pom.xml
+++ b/flink-sql-connector-elasticsearch7/pom.xml
@@ -34,6 +34,10 @@
 
 	<packaging>jar</packaging>
 
+	<properties>
+		<japicmp.skip>true</japicmp.skip>
+	</properties>
+
 	<dependencies>
 		<dependency>
 			<groupId>org.apache.flink</groupId>