feat(baserow): add one-time SSO warning JavaScript

- Introduced a generic sso_warning.js.j2 template under
  templates/roles/web-app/templates/javascripts/
- Included this template in web-app-baserow/templates/javascript.js.j2
- Added new variable js_application_name in
  roles/web-app-baserow/vars/main.yml to make the warning
  application-specific
- Implemented cookie-based logic so the warning is only shown once
  per user (default: 365 days)

Reference: https://chatgpt.com/share/68aecdae-82d0-800f-b05e-f2cb680664f1

roles/web-app-baserow/config/main.yml

@@ -4,6 +4,7 @@ features:
   desktop:          true
   central_database: true
   logout:           true
+  javascript:       true
 docker:
   services:
     redis: