Exclude sample modules from Maven Central release (#336)

* Add central-publishing-maven-plugin skip configuration to samples module

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

samples/pom.xml

@@ -132,6 +132,14 @@
           <skipNexusStagingDeployMojo>true</skipNexusStagingDeployMojo>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.sonatype.central</groupId>
+        <artifactId>central-publishing-maven-plugin</artifactId>
+        <configuration>
+          <!-- Prevent samples from being published to Maven Central -->
+          <skip>true</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>