feat: Add support for labels in automations (#11658)

- Add support for using labels as an action event for automation
 - Fix duplicated conversation_updated event dispatch for labels
 

Fixes https://github.com/chatwoot/chatwoot/issues/8539 and multiple
issues around duplication related to label change events.
---------

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

spec/models/automation_rule_spec.rb

@@ -60,6 +60,32 @@ RSpec.describe AutomationRule do
       expect(rule.valid?).to be false
       expect(rule.errors.messages[:conditions]).to eq(['Automation conditions should have query operator.'])
     end
+
+    it 'allows labels as a valid condition attribute' do
+      params[:conditions] = [
+        {
+          attribute_key: 'labels',
+          filter_operator: 'equal_to',
+          values: ['bug'],
+          query_operator: nil
+        }
+      ]
+      rule = FactoryBot.build(:automation_rule, params)
+      expect(rule.valid?).to be true
+    end
+
+    it 'validates label condition operators' do
+      params[:conditions] = [
+        {
+          attribute_key: 'labels',
+          filter_operator: 'is_present',
+          values: [],
+          query_operator: nil
+        }
+      ]
+      rule = FactoryBot.build(:automation_rule, params)
+      expect(rule.valid?).to be true
+    end
   end
 
   describe 'reauthorizable' do