[pom] Remove maven 2 attach description from site as not used correctly

This is for a pom and requires a descriptor to attach.  The parent gets 'No site descriptor found: nothing to attach.'.  And all other modules are not poms so they all fail respectively stating they are not poms.

pom.xml

@@ -338,14 +338,6 @@
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-site-plugin</artifactId>
           <version>3.12.1</version>
-          <executions>
-            <execution>
-              <id>attach-descriptor</id>
-              <goals>
-                <goal>attach-descriptor</goal>
-              </goals>
-            </execution>
-          </executions>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
@@ -552,15 +544,6 @@ limitations under the License.
               </execution>
             </executions>
           </plugin>
-          <plugin>
-            <artifactId>maven-site-plugin</artifactId>
-            <executions>
-              <execution>
-                <id>attach-descriptor</id>
-                <phase>none</phase>
-              </execution>
-            </executions>
-          </plugin>
           <plugin>
             <artifactId>maven-source-plugin</artifactId>
             <executions>