DEV: moves channel-archive-status to channels subscriptions (#19567)

It was quite an oddball because its a global subscription created on each channel. channels manager now allows us to elegantly solve this case.

plugins/chat/app/serializers/chat_channel_serializer.rb

@@ -111,7 +111,6 @@ class ChatChannelSerializer < ApplicationSerializer
         new_mentions:
           @opts[:new_mentions_message_bus_last_id] ||
             MessageBus.last_id(ChatPublisher.new_mentions_message_bus_channel(object.id)),
-        archive_status: MessageBus.last_id("/chat/channel-archive-status"),
       },
     }
   end

plugins/chat/app/serializers/structured_channel_serializer.rb

@@ -45,6 +45,8 @@ class StructuredChannelSerializer < ApplicationSerializer
       channel_edits: chat_message_bus_last_ids[ChatPublisher::CHANNEL_EDITS_MESSAGE_BUS_CHANNEL],
       channel_status: chat_message_bus_last_ids[ChatPublisher::CHANNEL_STATUS_MESSAGE_BUS_CHANNEL],
       new_channel: chat_message_bus_last_ids[ChatPublisher::NEW_CHANNEL_MESSAGE_BUS_CHANNEL],
+      archive_status:
+        chat_message_bus_last_ids[ChatPublisher::CHANNEL_ARCHIVE_STATUS_MESSAGE_BUS_CHANNEL],
     }
 
     if id =
@@ -67,6 +69,7 @@ class StructuredChannelSerializer < ApplicationSerializer
           ChatPublisher::CHANNEL_EDITS_MESSAGE_BUS_CHANNEL,
           ChatPublisher::CHANNEL_STATUS_MESSAGE_BUS_CHANNEL,
           ChatPublisher::NEW_CHANNEL_MESSAGE_BUS_CHANNEL,
+          ChatPublisher::CHANNEL_ARCHIVE_STATUS_MESSAGE_BUS_CHANNEL,
         ]
 
         if !scope.anonymous?

plugins/chat/app/services/chat_publisher.rb

@@ -230,6 +230,8 @@ module ChatPublisher
     )
   end
 
+  CHANNEL_ARCHIVE_STATUS_MESSAGE_BUS_CHANNEL = "/chat/channel-archive-status"
+
   def self.publish_archive_status(
     chat_channel,
     archive_status:,
@@ -238,7 +240,7 @@ module ChatPublisher
     total_messages:
   )
     MessageBus.publish(
-      "/chat/channel-archive-status",
+      CHANNEL_ARCHIVE_STATUS_MESSAGE_BUS_CHANNEL,
       {
         chat_channel_id: chat_channel.id,
         archive_failed: archive_status == :failed,