chore: improve plan-based feature handling with plan hierarchy (#11335)

- Refactor HandleStripeEventService to better manage features by plan
- Add constants for features available in each plan tier (Startup,
Business, Enterprise)
- Add channel_instagram to Startup plan features
- Improve downgrade handling to properly disable higher-tier features
- Clean up and optimize tests for maintainability
- Add comprehensive test coverage for plan upgrades and downgrades

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

enterprise/app/controllers/enterprise/api/v1/accounts_controller.rb

@@ -58,8 +58,7 @@ class Enterprise::Api::V1::AccountsController < Api::BaseController
   private
 
   def check_cloud_env
-    installation_config = InstallationConfig.find_by(name: 'DEPLOYMENT_ENV')
-    render json: { error: 'Not found' }, status: :not_found unless installation_config&.value == 'cloud'
+    render json: { error: 'Not found' }, status: :not_found unless ChatwootApp.chatwoot_cloud?
   end
 
   def default_limits

enterprise/app/controllers/enterprise/concerns/application_controller_concern.rb

@@ -1,12 +1,3 @@
 module Enterprise::Concerns::ApplicationControllerConcern
   extend ActiveSupport::Concern
-
-  included do
-    before_action :prepend_view_paths
-  end
-
-  # Prepend the view path to the enterprise/app/views won't be available by default
-  def prepend_view_paths
-    prepend_view_path 'enterprise/app/views/'
-  end
 end

enterprise/app/controllers/enterprise/super_admin/accounts_controller.rb

@@ -0,0 +1,15 @@
+module Enterprise::SuperAdmin::AccountsController
+  def update
+    # Handle manually managed features from form submission
+    if params[:account] && params[:account][:manually_managed_features].present?
+      # Update using the service - it will handle array conversion and validation
+      service = ::Internal::Accounts::InternalAttributesService.new(requested_resource)
+      service.manually_managed_features = params[:account][:manually_managed_features]
+
+      # Remove the manually_managed_features from params to prevent ActiveModel::UnknownAttributeError
+      params[:account].delete(:manually_managed_features)
+    end
+
+    super
+  end
+end