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>

app/javascript/shared/store/globalConfig.js

@@ -5,7 +5,6 @@ const {
   AZURE_APP_ID: azureAppId,
   BRAND_NAME: brandName,
   CHATWOOT_INBOX_TOKEN: chatwootInboxToken,
-  CSML_EDITOR_HOST: csmlEditorHost,
   CREATE_NEW_ACCOUNT_FROM_DASHBOARD: createNewAccountFromDashboard,
   DIRECT_UPLOADS_ENABLED: directUploadsEnabled,
   DISPLAY_MANIFEST: displayManifest,
@@ -29,7 +28,6 @@ const state = {
   azureAppId,
   brandName,
   chatwootInboxToken,
-  csmlEditorHost,
   deploymentEnv,
   createNewAccountFromDashboard,
   directUploadsEnabled: directUploadsEnabled === 'true',