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_mtd_vs_previous_year_metrics.sql

@@ -164,8 +164,12 @@ with
             and dimension_value <> 'UNSET'
     ),
     int_monthly_churn_metrics as (select * from {{ ref("int_monthly_churn_metrics") }}),
-    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'
     ),
 
     plain_kpi_combination as (
@@ -308,7 +312,7 @@ with
             churn.created_bookings_churn_average_contribution,
             churn.listings_booked_in_month_churn_average_contribution
 
-        from int_dates_mtd_by_dimension d
+        from int_kpis__agg_dates_main_kpis d
         left join
             created_bookings
             on d.date = created_bookings.end_date
@@ -498,6 +502,6 @@ left join
     and current.year = previous_year.year + 1
 where
     (
-        current.is_end_of_month = 1
-        or (current.is_current_month = 1 and current.day = previous_year.day)
+        current.is_end_of_month = true
+        or (current.is_current_month = true and current.day = previous_year.day)
     )