fix(tests): add missing vi.mock() to prevent vitest worker shutdown flake in InstantBookingCreateService (calcom#28773)

Signed-off-by: Mendral Agent <support@mendral.com>
Co-authored-by: Mendral Agent <support@mendral.com>

Author: mendral-agent

packages/features/bookings/lib/service/InstantBookingCreateService.test.ts

@@ -22,6 +22,10 @@ vi.mock("@calcom/features/notifications/sendNotification", () => ({
   sendNotification: vi.fn(),
 }));
 
+vi.mock("@calcom/app-store/feishucalendar/lib/CalendarService", () => ({
+  default: class MockFeishuCalendarService {},
+}));
+
 vi.mock("@calcom/features/conferencing/lib/videoClient", () => ({
   createInstantMeetingWithCalVideo: vi.fn().mockResolvedValue({
     type: "daily_video",