FEATURE: Admin plugin list redesign (#24363)

* Remove checkmark for official plugins
* Add author for plugin, which is By Discourse for all discourse
  and discourse-org github plugins
* Link to meta topic instead of github repo
* Add experimental flag for plugin metadata and show this as a
  badge on the plugin list if present

---------

Co-authored-by: chapoi <101828855+chapoi@users.noreply.github.com>

app/serializers/admin_plugin_serializer.rb

@@ -11,9 +11,12 @@ class AdminPluginSerializer < ApplicationSerializer
              :enabled_setting,
              :has_settings,
              :is_official,
+             :is_experimental,
+             :is_discourse_owned,
              :commit_hash,
              :commit_url,
-             :meta_url
+             :meta_url,
+             :authors
 
   def id
     object.directory_name
@@ -35,6 +38,10 @@ class AdminPluginSerializer < ApplicationSerializer
     object.metadata.url
   end
 
+  def authors
+    object.metadata.authors
+  end
+
   def enabled
     object.enabled?
   end
@@ -72,6 +79,14 @@ class AdminPluginSerializer < ApplicationSerializer
     Plugin::Metadata::OFFICIAL_PLUGINS.include?(object.name)
   end
 
+  def is_experimental
+    object.metadata.experimental
+  end
+
+  def is_discourse_owned
+    object.discourse_owned?
+  end
+
   def commit_hash
     object.commit_hash
   end