fix(bom): skip deployment of bom-generator-plugin

The bom-generator-plugin is an internal build tool that should not be
published to Maven Central. During snapshot releases, the plugin was
being deployed early in the build, causing checksum validation failures
when later modules tried to resolve its metadata due to Sonatype Central
replication delays.

This complements commit 5552acd which excluded the plugin from generated
BOMs. That fix prevented the plugin from appearing as a BOM dependency,
but didn't prevent the plugin itself from being deployed.

Adding maven.deploy.skip=true follows the same pattern used by other
internal modules (tekton/examples, karaf/itests, chaos-tests).

Fixes: https://github.com/fabric8io/kubernetes-client/actions/runs/22090965078

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: manusa

bom-generator-plugin/pom.xml

@@ -32,6 +32,10 @@
 
   <packaging>maven-plugin</packaging>
 
+  <properties>
+    <maven.deploy.skip>true</maven.deploy.skip>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>org.apache.maven</groupId>