fix: Remove the import documents notification upgrade plugin - EXO-68085

After reusing the generic configurable Notification Upgrade Plugin to enable the ImportDocumentsPlugin ,there is no longer a need for this upgrade plugin , this change is going to remove the import documents notification upgrade plugin .

data-upgrade-notifications/src/main/resources/conf/portal/configuration.xml

@@ -65,45 +65,6 @@
         </value-param>
       </init-params>
     </component-plugin>
-
-    <component-plugin>
-      <name>ImportDocumentsNotificationUpgradePlugin</name>
-      <set-method>addUpgradePlugin</set-method>
-      <type>org.exoplatform.portal.upgrade.notification.ImportDocumentsNotificationUpgradePlugin</type>
-      <description>Import Documents Notification Upgrade Plugin</description>
-      <init-params>
-        <value-param>
-          <name>product.group.id</name>
-          <description>The groupId of the product</description>
-          <value>org.exoplatform.platform</value>
-        </value-param>
-        <value-param>
-          <name>plugin.execution.order</name>
-          <description>The plugin execution order</description>
-          <value>1</value>
-        </value-param>
-        <value-param>
-          <name>plugin.upgrade.execute.once</name>
-          <description>Execute this upgrade plugin only once</description>
-          <value>true</value>
-        </value-param>
-        <value-param>
-          <name>plugin.upgrade.target.version</name>
-          <description>Target version of the plugin</description>
-          <value>6.6.0</value>
-        </value-param>
-        <value-param>
-          <name>plugin.upgrade.async.execution</name>
-          <description>Execute this upgrade asynchronously</description>
-          <value>true</value>
-        </value-param>
-        <value-param>
-          <name>notification.plugin.type</name>
-          <description>the notification plugin type</description>
-          <value>ImportDocumentsPlugin</value>
-        </value-param>
-      </init-params>
-    </component-plugin>
   </external-component-plugins>
 </configuration>