FIX: removes missed chat_channels legacy paths (#19634)

- chat-channel-by-name is no longer supported
- chat_channels_controller doesn’t exist anymore

plugins/chat/assets/javascripts/discourse/chat-route-map.js

@@ -20,6 +20,5 @@ export default function () {
       this.route("archived", { path: "/archived" });
     });
     this.route("message", { path: "/message/:messageId" });
-    this.route("channelByName", { path: "/chat_channels/:channelName" });
   });
 }

plugins/chat/assets/javascripts/discourse/routes/chat-channel-by-name.js

@@ -1,28 +0,0 @@
-import DiscourseRoute from "discourse/routes/discourse";
-import { defaultHomepage } from "discourse/lib/utilities";
-import { ajax } from "discourse/lib/ajax";
-import { inject as service } from "@ember/service";
-
-export default class ChatChannelByNameRoute extends DiscourseRoute {
-  @service chat;
-
-  async model(params) {
-    return ajax(
-      `/chat/chat_channels/${encodeURIComponent(params.channelName)}.json`
-    )
-      .then((response) => {
-        this.transitionTo(
-          "chat.channel",
-          response.channel.id,
-          response.channel.title
-        );
-      })
-      .catch(() => this.replaceWith("/404"));
-  }
-
-  beforeModel() {
-    if (!this.chat.userCanChat) {
-      return this.transitionTo(`discovery.${defaultHomepage()}`);
-    }
-  }
-}

plugins/chat/plugin.rb

@@ -627,12 +627,6 @@ after_initialize do
     # incoming_webhooks_controller routes
     post "/hooks/:key/slack" => "incoming_chat_webhooks#create_message_slack_compatible"
 
-    # chat_channel_controller routes
-    get "/chat_channels" => "chat_channels#index"
-    post "/chat_channels/:chat_channel_id/notification_settings" =>
-           "chat_channels#notification_settings"
-    get "/chat_channels/:chat_channel_id" => "chat_channels#show"
-
     # chat_controller routes
     get "/" => "chat#respond"
     get "/browse" => "chat#respond"