Merged PR 2824: Propagates Billing Country and Deal Name into int_dates_by_deal

# Description

Changes:
* Adding `main_deal_name` and `main_billing_country_iso_3_per_deal` in `int_dates_by_deal` model.
* Documents the 2 new fields. Also, ensures `main_deal_name` is not null
* Removes `id_deal not null` condition since it's enforced on the inner join with `int_core__deal`

# 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: #18911, #19083

models/intermediate/cross/int_dates_by_deal.sql

@@ -1,9 +1,9 @@
-
 {{ config(materialized="table", unique_key=["date", "id_deal"]) }}
 
 with
     int_dates as (select * from {{ ref("int_dates") }}),
-    int_core__unified_user as (select * from {{ ref("int_core__unified_user") }})
+    int_core__unified_user as (select * from {{ ref("int_core__unified_user") }}),
+    int_core__deal as (select * from {{ ref("int_core__deal") }})
 
 select distinct
     d.year_number as year,
@@ -11,16 +11,18 @@ select distinct
     d.day_of_month as day,
     d.date_day as date,
     u.id_deal,
+    deal.main_deal_name,
+    deal.main_billing_country_iso_3_per_deal,
     d.month_start_date as first_day_month,
     d.month_end_date as last_day_month
 from int_core__unified_user u
 inner join int_dates d on d.date_day >= u.created_date_utc
+inner join int_core__deal deal on deal.id_deal = u.id_deal
 where
-    u.id_deal is not null
     -- include only up-to yesterday
-    and now()::date > d.date_day
+    now()::date > d.date_day
     and (
-		-- keep all last day of the month
+        -- keep all last day of the month
         d.date_day = d.month_end_date
         -- keep yesterday
         or now()::date = d.date_day + 1

models/intermediate/cross/schema.yml

@@ -303,6 +303,19 @@ models:
         tests:
           - not_null
 
+      - name: main_deal_name
+        data_type: string
+        description: |
+          Main name for this ID deal.
+        tests:
+          - not_null
+
+      - name: main_billing_country_iso_3_per_deal
+        data_type: string
+        description: |
+          ISO 3166-1 alpha-3 main country code in which the Deal is billed.
+          In some cases it's null.
+
   - name: int_mtd_aggregated_metrics
     description: |
       The `int_mtd_aggregated_metrics` model aggregates multiple metrics on a year, month, and day basis.