feat(bms): Update BMS Free Message E2E tests with new discount features

- Enhanced test cases for BMS Free messages by adding discount rates and fixed discounts to commerce items.
- Updated video URLs in tests to valid links and added notes for clarity on video URL handling.
- Improved overall test coverage for BMS Free message types, ensuring accurate representation of discount functionalities.

These changes ensure that the E2E tests reflect the latest features and maintain robustness in testing BMS messages.

Author: Palbahngmiyine

test/services/messages/bms-free.e2e.test.ts

@@ -763,10 +763,16 @@ describe('BMS Free Message E2E', () => {
                 carousel: {
                   list: [
                     createCarouselCommerceItem(imageId, {
-                      commerce: createBmsCommerce({title: '상품 1'}),
+                      commerce: createBmsCommerce({
+                        title: '상품 1',
+                        discountRate: 10,
+                      }),
                     }),
                     createCarouselCommerceItem(imageId, {
-                      commerce: createBmsCommerce({title: '상품 2'}),
+                      commerce: createBmsCommerce({
+                        title: '상품 2',
+                        discountFixed: 2000,
+                      }),
                     }),
                   ],
                 },
@@ -833,20 +839,24 @@ describe('BMS Free Message E2E', () => {
                           title: '프리미엄 상품 1',
                           regularPrice: 30000,
                           discountPrice: 25000,
+                          discountRate: 17,
                         }),
                         additionalContent: '추가 정보',
                         imageLink: 'https://example.com/product1',
                         buttons: [
                           createBmsLinkButton('WL'),
                           createBmsLinkButton('AL'),
                         ],
-                        coupon: createBmsCoupon('won'),
+                        coupon: {
+                          ...createBmsCoupon('won'),
+                        },
                       }),
                       createCarouselCommerceItem(imageId, {
                         commerce: createBmsCommerce({
                           title: '프리미엄 상품 2',
                           regularPrice: 40000,
                           discountPrice: 35000,
+                          discountFixed: 5000,
                         }),
                         buttons: [createBmsLinkButton('WL')],
                       }),
@@ -899,7 +909,8 @@ describe('BMS Free Message E2E', () => {
               pfId: channel.channelId,
               bms: createBmsOption('PREMIUM_VIDEO', {
                 video: {
-                  videoUrl: 'https://tv.kakao.com/v/123456789',
+                  // NOTE: 발송 간 유효하지 않은 동영상 URL을 기입하면 발송 상태가 그룹 정보를 찾을 수 없음 오류로 표시됩니다.
+                  videoUrl: 'https://tv.kakao.com/v/460734285',
                 },
               }),
             },
@@ -954,7 +965,8 @@ describe('BMS Free Message E2E', () => {
                   header: '비디오 헤더',
                   content: '비디오 내용입니다.',
                   video: {
-                    videoUrl: 'https://tv.kakao.com/v/123456789',
+                    // NOTE: 발송 간 유효하지 않은 동영상 URL을 기입하면 발송 상태가 그룹 정보를 찾을 수 없음 오류로 표시됩니다.
+                    videoUrl: 'https://tv.kakao.com/v/460734285',
                     imageId,
                     imageLink: 'https://example.com/video',
                   },