feat: Implement UI for Agent Bots in settings and remove CSML support (#11276)

- Add agent bots management UI in settings with avatar upload
- Enable agent bot configuration for all inbox types
- Implement proper CRUD operations with webhook URL support
- Fix agent bots menu item visibility in settings sidebar
- Remove all CSML-related code and features
- Add migration to convert existing CSML bots to webhook bots
- Simplify agent bot model and services to focus on webhook bots
- Improve UI to differentiate between system bots and account bots

## Video 





https://github.com/user-attachments/assets/3f4edbb7-b758-468c-8dd6-a9537b983f7d

---------

Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

spec/controllers/api/v1/accounts/agent_bots_controller_spec.rb

@@ -28,6 +28,31 @@ RSpec.describe 'Agent Bot API', type: :request do
         expect(response.body).to include(agent_bot.access_token.token)
         expect(response.body).not_to include(global_bot.access_token.token)
       end
+
+      it 'properly differentiates between system bots and account bots' do
+        global_bot = create(:agent_bot)
+        get "/api/v1/accounts/#{account.id}/agent_bots",
+            headers: agent.create_new_auth_token,
+            as: :json
+
+        response_data = response.parsed_body
+        # Find the global bot in the response
+        global_bot_response = response_data.find { |bot| bot['id'] == global_bot.id }
+        # Find the account bot in the response
+        account_bot_response = response_data.find { |bot| bot['id'] == agent_bot.id }
+
+        # Verify system_bot attribute and outgoing_url for global bot
+        expect(global_bot_response['system_bot']).to be(true)
+        expect(global_bot_response).not_to include('outgoing_url')
+
+        # Verify account bot has system_bot attribute false and includes outgoing_url
+        expect(account_bot_response['system_bot']).to be(false)
+        expect(account_bot_response).to include('outgoing_url')
+
+        # Verify both bots have thumbnail field
+        expect(global_bot_response).to include('thumbnail')
+        expect(account_bot_response).to include('thumbnail')
+      end
     end
   end
 
@@ -60,6 +85,10 @@ RSpec.describe 'Agent Bot API', type: :request do
         expect(response).to have_http_status(:success)
         expect(response.body).to include(global_bot.name)
         expect(response.body).not_to include(global_bot.access_token.token)
+
+        # Test for system_bot attribute and webhook URL not being exposed
+        expect(response.parsed_body['system_bot']).to be(true)
+        expect(response.parsed_body).not_to include('outgoing_url')
       end
     end
   end
@@ -142,7 +171,7 @@ RSpec.describe 'Agent Bot API', type: :request do
         expect(response.body).not_to include(global_bot.access_token.token)
       end
 
-      it 'updates avatar' do
+      it 'updates avatar and includes thumbnail in response' do
         # no avatar before upload
         expect(agent_bot.avatar.attached?).to be(false)
         file = fixture_file_upload(Rails.root.join('spec/assets/avatar.png'), 'image/png')
@@ -153,6 +182,9 @@ RSpec.describe 'Agent Bot API', type: :request do
         expect(response).to have_http_status(:success)
         agent_bot.reload
         expect(agent_bot.avatar.attached?).to be(true)
+
+        # Verify thumbnail is included in the response
+        expect(response.parsed_body).to include('thumbnail')
       end
 
       it 'updated avatar with avatar_url' do