Merged PR 4304: Adds Cancelled and Not Cancelled Created Bookings

# Description

First commit - should be an exact replica of the previous PR on Check-Out:

Adds Cancelled and Not Cancelled Created Bookings as absolute figures. Adds Cancellation Rate only for aggregated models.
I also added the removal of duplicate bookings. Otherwise the rates might be affected, and this should be cleaner anyway.

Second commit:
Small changes on the unique key description of the model for check-out, doesn't impact the model output.

# Checklist

- [X] The edited models and dependants run properly with production data.
- [X] The edited models are sufficiently documented.
- [X] The edited models contain PK tests, and I've ran and passed them.
- [X] I have checked for DRY opportunities with other models and docs.
- [X] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

Related work items: #24637

models/intermediate/kpis/int_kpis__metric_daily_created_bookings.sql

@@ -14,7 +14,21 @@ select
         icmas.active_accommodations_per_deal_segmentation, 'UNSET'
     ) as active_accommodations_per_deal_segmentation,
     -- Metrics --
-    count(distinct icb.id_booking) as created_bookings
+    count(distinct icb.id_booking) as created_bookings,
+    count(
+        distinct case
+            when upper(icb.booking_state) = {{ var("cancelled_booking_state") }}
+            then icb.id_booking
+            else null
+        end
+    ) as cancelled_created_bookings,
+    count(
+        distinct case
+            when not upper(icb.booking_state) = {{ var("cancelled_booking_state") }}
+            then icb.id_booking
+            else null
+        end
+    ) as not_cancelled_created_bookings
 from {{ ref("int_core__bookings") }} as icb
 left join
     {{ ref("int_core__user_host") }} as icuh on icb.id_user_host = icuh.id_user_host
@@ -26,4 +40,5 @@ left join
 left join
     {{ ref("int_core__booking_to_product_bundle") }} as icbtpb
     on icb.id_booking = icbtpb.id_booking
+where icb.is_duplicate_booking = false
 group by 1, 2, 3, 4, 5