Merged PR 3391: Adds Check-Out, Cancelled and Billable Bookings

# Description

Adds Check-Out, Cancelled and Billable Bookings in the new KPI flow.

For each of these metrics, it includes:
* Daily model
* Monthly/MTD without dimension aggregates
* Monthly/MTD with dimension aggregates
* Schema entries for the abovementioned 5 models
* Temporary test to compare the different metrics against current production KPIs

I also implemented a quick performance fix that removes the dependency of Billable Bookings from Booking Charge Events, since Bookings table already contains the needed information.

# 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.
- [NA] 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: #23454

models/intermediate/kpis/int_kpis__metric_monthly_billable_bookings.sql

@@ -0,0 +1,27 @@
+{{
+    config(
+        materialized="view",
+        unique_key=[
+            "end_date",
+            "id_deal",
+            "active_accommodations_per_deal_segmentation",
+        ],
+    )
+}}
+
+select
+    -- Unique Key --
+    d.first_day_month as start_date,
+    d.date as end_date,
+    b.id_deal,
+    b.active_accommodations_per_deal_segmentation,
+    -- Dimensions --
+    b.main_billing_country_iso_3_per_deal,
+    -- Metrics --
+    sum(b.billable_bookings) as billable_bookings
+from {{ ref("int_kpis__dimension_dates") }} d
+left join
+    {{ ref("int_kpis__metric_daily_billable_bookings") }} b
+    on date_trunc('month', b.date)::date = d.first_day_month
+where d.is_end_of_month = true and b.id_deal is not null
+group by 1, 2, 3, 4, 5