fix(automations): strip execution_delay when cloning a rule with the feature off

clone duplicates the rule via dup (including execution_delay) with no param for
ensure_execution_delay_allowed to inspect, so it could create new delayed rules
while the feature is disabled. Drop the delay on the clone unless the account has
delayed_automations enabled, matching create/update.

app/controllers/api/v1/accounts/automation_rules_controller.rb

@@ -49,6 +49,9 @@ class Api::V1::Accounts::AutomationRulesController < Api::V1::Accounts::BaseCont
   def clone
     automation_rule = Current.account.automation_rules.find_by(id: params[:automation_rule_id])
     new_rule = automation_rule.dup
+    # dup copies execution_delay; drop it when the feature is off so clone can't create new
+    # delayed rules that create/update would reject.
+    new_rule.execution_delay = nil unless delayed_automations_enabled?
     new_rule.save!
     @automation_rule = new_rule
   end