[JENKINS-62332] Show when a plugin version newer than offered exists (#4742)

* [JENKINS-62332] Show when a plugin version newer than offered exists

* Add more obvious label/tag to entries that cannot be installed

Also link to plugin documentation from the detail message

* Also show the list if there are any unavailable updates

Co-authored-by: Daniel Beck <daniel-beck@users.noreply.github.com>

core/src/main/java/hudson/PluginManager.java

@@ -2266,6 +2266,14 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
         return Arrays.asList(categories).contains("adopt-this-plugin");
     }
 
+    @Restricted(DoNotUse.class) // Used from table.jelly
+    public boolean hasLatestVersionNewerThanOffered(UpdateSite.Plugin plugin) {
+        if (plugin.latest == null) {
+            return false;
+        }
+        return !plugin.latest.equalsIgnoreCase(plugin.version); // we can assume that any defined 'latest' will be newer than the actual offered version
+    }
+
     @Restricted(DoNotUse.class) // Used from table.jelly
     public boolean hasAdoptThisPluginLabel(PluginWrapper plugin) {
         final UpdateSite.Plugin pluginMeta = Jenkins.get().getUpdateCenter().getPlugin(plugin.getShortName());