feat: Add backend changes for whatsapp csat template (#12984)

This PR add the backend changes for the feature [sending CSAT surveys
via WhatsApp message templates
](https://github.com/chatwoot/chatwoot/pull/12787)

---------

Co-authored-by: Vinay Keerthi <11478411+stonecharioteer@users.noreply.github.com>

spec/services/whatsapp/providers/whatsapp_cloud_service_spec.rb

@@ -312,4 +312,92 @@ describe Whatsapp::Providers::WhatsappCloudService do
       end
     end
   end
+
+  describe 'CSAT template methods' do
+    let(:mock_csat_template_service) { instance_double(Whatsapp::CsatTemplateService) }
+    let(:expected_template_name) { "customer_satisfaction_survey_#{whatsapp_channel.inbox.id}" }
+    let(:template_config) do
+      {
+        name: expected_template_name,
+        language: 'en',
+        category: 'UTILITY'
+      }
+    end
+
+    before do
+      allow(Whatsapp::CsatTemplateService).to receive(:new)
+        .with(whatsapp_channel)
+        .and_return(mock_csat_template_service)
+    end
+
+    describe '#create_csat_template' do
+      it 'delegates to csat_template_service with correct config' do
+        allow(mock_csat_template_service).to receive(:create_template)
+          .with(template_config)
+          .and_return({ success: true, template_id: '123' })
+
+        result = service.create_csat_template(template_config)
+
+        expect(mock_csat_template_service).to have_received(:create_template).with(template_config)
+        expect(result).to eq({ success: true, template_id: '123' })
+      end
+    end
+
+    describe '#delete_csat_template' do
+      it 'delegates to csat_template_service with default template name' do
+        allow(mock_csat_template_service).to receive(:delete_template)
+          .with(expected_template_name)
+          .and_return({ success: true })
+
+        result = service.delete_csat_template
+
+        expect(mock_csat_template_service).to have_received(:delete_template).with(expected_template_name)
+        expect(result).to eq({ success: true })
+      end
+
+      it 'delegates to csat_template_service with custom template name' do
+        custom_template_name = 'custom_csat_template'
+        allow(mock_csat_template_service).to receive(:delete_template)
+          .with(custom_template_name)
+          .and_return({ success: true })
+
+        result = service.delete_csat_template(custom_template_name)
+
+        expect(mock_csat_template_service).to have_received(:delete_template).with(custom_template_name)
+        expect(result).to eq({ success: true })
+      end
+    end
+
+    describe '#get_template_status' do
+      it 'delegates to csat_template_service with template name' do
+        template_name = 'customer_survey_template'
+        expected_response = { success: true, template: { status: 'APPROVED' } }
+        allow(mock_csat_template_service).to receive(:get_template_status)
+          .with(template_name)
+          .and_return(expected_response)
+
+        result = service.get_template_status(template_name)
+
+        expect(mock_csat_template_service).to have_received(:get_template_status).with(template_name)
+        expect(result).to eq(expected_response)
+      end
+    end
+
+    describe 'csat_template_service memoization' do
+      it 'creates and memoizes the csat_template_service instance' do
+        allow(Whatsapp::CsatTemplateService).to receive(:new)
+          .with(whatsapp_channel)
+          .and_return(mock_csat_template_service)
+        allow(mock_csat_template_service).to receive(:get_template_status)
+          .and_return({ success: true })
+
+        # Call multiple methods that use the service
+        service.get_template_status('test1')
+        service.get_template_status('test2')
+
+        # Verify the service was only instantiated once
+        expect(Whatsapp::CsatTemplateService).to have_received(:new).once
+      end
+    end
+  end
 end