Fix AND prefix on rule form (#2234)

* Fix AND prefix on rule form

This new condition prefix data target is used to ensure the AND prefix is added/removed to additional conditions/groups when there aren't any saved conditions yet.

* Ensure the condition group "Add condition" button is type button to avoid form submission

* Add prefix update when removing a subcondition

* Use data condition to update the prefix on conditions, condition groups, and subconditions

* Use condition remove instead of element remove for condition groups so prefix logic runs

* Add back explicit show_prefixes to ensure subconditions never have a prefix

* Run the prefix update runs on a load of a form, which handles prefixes on an edit since no conditions change

* Ensure saved items that are marked for removal don't impact the index

* Simplify logic since we don't process subconditions

* Clean up comments

* Add primary_condition_title field to rule model

app/models/rule.rb

@@ -46,6 +46,18 @@ class Rule < ApplicationRecord
     RuleJob.perform_later(self, ignore_attribute_locks: ignore_attribute_locks)
   end
 
+  def primary_condition_title
+    return "No conditions" if conditions.none?
+
+    first_condition = conditions.first
+    if first_condition.compound? && first_condition.sub_conditions.any?
+      first_sub_condition = first_condition.sub_conditions.first
+      "If #{first_sub_condition.filter.label.downcase} #{first_sub_condition.operator} #{first_sub_condition.value_display}"
+    else
+      "If #{first_condition.filter.label.downcase} #{first_condition.operator} #{first_condition.value_display}"
+    end
+  end
+
   private
     def matching_resources_scope
       scope = registry.resource_scope