feat: add automation condition to filter private notes (#12102)

## Summary

Adds a new automation condition to filter private notes.

This allows automation rules to explicitly include or exclude private
notes instead of relying on implicit behavior.

Fixes: #11208 

## Preview



https://github.com/user-attachments/assets/c40f6910-7bbf-4e59-aae5-ad408602927a

spec/listeners/automation_rule_listener_spec.rb

@@ -220,6 +220,15 @@ describe AutomationRuleListener do
         expect(AutomationRules::ActionService).not_to have_received(:new)
       end
 
+      it 'calls AutomationRules::ActionService if message is a private note' do
+        message.update!(private: true)
+        allow(condition_match).to receive(:present?).and_return(true)
+
+        listener.message_created(event)
+
+        expect(AutomationRules::ActionService).to have_received(:new).with(automation_rule, account, conversation)
+      end
+
       it 'does not call AutomationRules::ActionService if conditions do not match based on content' do
         message.update!(processed_message_content: 'hi', content: "hi\n\nhello")
         allow(condition_match).to receive(:present?).and_return(false)

spec/models/automation_rule_spec.rb

@@ -86,6 +86,19 @@ RSpec.describe AutomationRule do
       rule = FactoryBot.build(:automation_rule, params)
       expect(rule.valid?).to be true
     end
+
+    it 'allows private_note as a valid condition attribute' do
+      params[:conditions] = [
+        {
+          attribute_key: 'private_note',
+          filter_operator: 'equal_to',
+          values: [true],
+          query_operator: nil
+        }
+      ]
+      rule = FactoryBot.build(:automation_rule, params)
+      expect(rule.valid?).to be true
+    end
   end
 
   describe 'reauthorizable' do

spec/services/automation_rules/condition_validation_service_spec.rb

@@ -10,7 +10,8 @@ RSpec.describe AutomationRules::ConditionValidationService do
         rule.conditions = [
           { 'values': ['open'], 'attribute_key': 'status', 'query_operator': nil, 'filter_operator': 'equal_to' },
           { 'values': ['+918484'], 'attribute_key': 'phone_number', 'query_operator': 'OR', 'filter_operator': 'contains' },
-          { 'values': ['test'], 'attribute_key': 'email', 'query_operator': nil, 'filter_operator': 'contains' }
+          { 'values': ['test'], 'attribute_key': 'email', 'query_operator': 'OR', 'filter_operator': 'contains' },
+          { 'values': [true], 'attribute_key': 'private_note', 'query_operator': nil, 'filter_operator': 'equal_to' }
         ]
         rule.save
       end

spec/services/automation_rules/conditions_filter_service_spec.rb

@@ -83,6 +83,27 @@ RSpec.describe AutomationRules::ConditionsFilterService do
         end
       end
 
+      context 'when filtering private notes' do
+        before do
+          rule.conditions = [
+            { 'values': [true], 'attribute_key': 'private_note', 'query_operator': nil, 'filter_operator': 'equal_to' }
+          ]
+          rule.save
+        end
+
+        it 'will return true when the message is a private note' do
+          message.update!(private: true)
+
+          expect(described_class.new(rule, conversation, { message: message, changed_attributes: {} }).perform).to be(true)
+        end
+
+        it 'will return false when the message is not a private note' do
+          message.update!(private: false)
+
+          expect(described_class.new(rule, conversation, { message: message, changed_attributes: {} }).perform).to be(false)
+        end
+      end
+
       context 'when filter_operator is on processed_message_content' do
         before do
           rule.conditions = [