Merged PR 3482: Adapts date dimension skeleton for Main KPIs

# Description

New model:
* int_kpis__agg_dates_main_kpis - Serves as the skeleton of dates and dimensions for Main KPIs. It's aggregated since it follows a similar aggregation strategy. It's a single model to feed both Main KPIs visualisations. Note boolean fields are real booleans (true/false) while before these were integers (1/0). This also affects downstream models.

Main KPIs flow adaptations to new skeleton model:
* int_monthly_aggregated_metrics_history_by_deal
* int_monthly_churn_metrics - additionally, calls usual KPIs macro instead of old one
* int_mtd_vs_previous_year_metrics

Reporting changes to ensure report is not down:
* mtd_aggregated_metrics - adaptations on booleans (true-1, false-0)

Cleaning:
* get_kpi_dimensions macro is no longer used
* int_dates_by_deal model and schema entry
* int_dates_mtd_by_dimension model and schema entry
* int_dates_mtd model and schema entry

# 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: #23763

models/intermediate/cross/int_monthly_churn_metrics.sql

@@ -1,4 +1,4 @@
-{% set dimensions = get_kpi_dimensions() %}
+{% set dimensions = get_kpi_dimensions_per_model("CHURN_RATES") %}
 {% set churn_lifecycle_states = "('05-Churning')" %}
 
 {{ config(materialized="table", unique_key=["date", "dimension", "dimension_value"]) }}
@@ -6,8 +6,12 @@ with
     int_monthly_12m_window_contribution_by_deal as (
         select * from {{ ref("int_monthly_12m_window_contribution_by_deal") }}
     ),
-    int_dates_mtd_by_dimension as (
-        select * from {{ ref("int_dates_mtd_by_dimension") }}
+    int_kpis__agg_dates_main_kpis as (
+        select *
+        from {{ ref("int_kpis__agg_dates_main_kpis") }}
+        where
+            dimension in ('global', 'by_number_of_listings', 'by_billing_country')
+            and dimension_value <> 'UNSET'
     ),
     int_kpis__dimension_daily_accommodation as (
         select * from {{ ref("int_kpis__dimension_daily_accommodation") }}
@@ -78,7 +82,7 @@ select
     cast(
         c.listings_booked_in_month_churn_average_contribution as numeric(19, 6)
     ) as listings_booked_in_month_churn_average_contribution
-from int_dates_mtd_by_dimension d
+from int_kpis__agg_dates_main_kpis d
 left join
     churn_metrics_per_date c
     on c.date = d.date
@@ -86,4 +90,4 @@ left join
     and c.dimension_value = d.dimension_value
 -- Remove current month dates since data won't be available anyway. This is specific
 -- for this churn metrics model
-where d.is_current_month = 0
+where d.is_current_month = false