Merged PR 2689: KPIs by Billing Country

# Description

Adds Billing Country dimension in KPIs, but does not expose them to reporting yet.
Silly thing, based on the macros I built, I cannot make incremental changes unless changing all models. This will need to be adapted, happy to hear your thoughts on how we do it.
Additionally, I have lack of performance of the model `mtd_guest_payments_metrics`. It takes around 5 min to execute, but technically the end-to-end runs in one shoot without breaking.
It's a complex PR because it changes many files, but you will see that:
* It mostly changes the join conditions for the dimensions or the schema tests,
* I tried to be very careful and add things step-by-step in the commits.

Goal is NOT to complete the PR yet until we see how we can improve performance. I can say though that data end-to-end looks ok to me, but would benefit from checking with production data for the new dimension

Update 30th Aug
* Added a new commit that includes `id_user_host` in `int_core__verification_payments`. Happy to discuss if it makes sense or not. But it changes the execution from ~600 sec to ~6 sec because it avoids a massive repeated join with `verification_requests`.

# 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.
- [ ] I've picked the right materialization for the affected models. **To check because of performance issues**

# Other

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

Related work items: #19082

models/intermediate/cross/int_dates_mtd_by_dimension.sql

@@ -7,6 +7,9 @@ with
     int_core__mtd_accommodation_segmentation as (
         select * from {{ ref("int_core__mtd_accommodation_segmentation") }}
     ),
+    int_core__user_host as (
+        select * from {{ ref("int_core__user_host") }}
+    ),
     int_dates_mtd as (select * from {{ ref("int_dates_mtd") }})
 
 {% for dimension in dimensions %}
@@ -25,6 +28,10 @@ with
     {% if dimension.dimension == "'by_number_of_listings'" %}
         inner join int_core__mtd_accommodation_segmentation a
 		on d.date = a.date
+    {% elif dimension.dimension == "'by_billing_country'" %}
+        inner join int_core__user_host h 
+        on d.date >= h.created_date_utc 
+        and h.billing_country_iso_3 is not null
     {% endif %} 
     {% if not loop.last %}
         union all

models/intermediate/cross/schema.yml

@@ -167,6 +167,7 @@ models:
                 values:
                 - global
                 - by_number_of_listings
+                - by_billing_country
       
       - name: dimension_value
         data_type: string
@@ -375,6 +376,7 @@ models:
                 values:
                 - global
                 - by_number_of_listings
+                - by_billing_country
       
       - name: dimension_value
         data_type: string
@@ -549,6 +551,7 @@ models:
                 values:
                 - global
                 - by_number_of_listings
+                - by_billing_country
       
       - name: dimension_value
         data_type: string