feat: Update the slack integration-flow to allow users to select the channel (#7637)

config/routes.rb

@@ -190,12 +190,16 @@ Rails.application.routes.draw do
           resources :webhooks, only: [:index, :create, :update, :destroy]
           namespace :integrations do
             resources :apps, only: [:index, :show]
-            resources :hooks, only: [:create, :update, :destroy] do
+            resources :hooks, only: [:show, :create, :update, :destroy] do
               member do
                 post :process_event
               end
             end
-            resource :slack, only: [:create, :update, :destroy], controller: 'slack'
+            resource :slack, only: [:create, :update, :destroy], controller: 'slack' do
+              member do
+                get :list_all_channels
+              end
+            end
             resource :dyte, controller: 'dyte', only: [] do
               collection do
                 post :create_a_meeting