[FLINK-36659] Bump to 2.0-preview1 and remove flink-connector-jdbc module.

Author: lvyanquan

flink-connector-jdbc-backward-compatibility/pom.xml

@@ -64,6 +64,12 @@
             <type>test-jar</type>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-connector-jdbc-postgres</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.apache.flink</groupId>
             <artifactId>flink-connector-jdbc-postgres</artifactId>