restore skip-code-generation property usage (#2407)

Author: hboutemy

pom.xml

@@ -994,6 +994,9 @@
           <groupId>org.apache.plc4x.plugins</groupId>
           <artifactId>plc4x-maven-plugin</artifactId>
           <version>${plc4x-code-generation.version}</version>
+          <configuration>
+            <skip>${skip-code-generation}</skip>
+          </configuration>
         </plugin>
 
         <plugin>