Revert "fix: Don’t allow hosts to cancel a booking without providing a reason through v1 (#23647)"

This reverts commit 3c72d7a.

Author: emrysal

apps/api/v1/lib/validations/booking.ts

@@ -41,7 +41,7 @@ export const bookingCancelSchema = z.object({
   id: z.number(),
   allRemainingBookings: z.boolean().optional(),
   cancelSubsequentBookings: z.boolean().optional(),
-  cancellationReason: z.string().min(1).optional(),
+  cancellationReason: z.string().optional().default("Not Provided"),
   seatReferenceUid: z.string().optional(),
   cancelledBy: z.string().email({ message: "Invalid email" }).optional(),
   internalNote: z