Merged PR 2825: Propagates deal Name and Billing Country in int_monthly_aggregated_metrics_history_by_deal

# Description

Changes (only in intermediate):
* Applies sqlfmt in KPIs source models (for some of them it was already applied). Specifically, the 3 Core models ONLY contains formatting changes
![image.png](https://guardhog.visualstudio.com/4148d95f-4b6d-4205-bcff-e9c8e0d2ca65/_apis/git/repositories/54ac356f-aad7-46d2-b62c-e8c5b3bb8ebf/pullRequests/2825/attachments/image.png)

* Adds `main_deal_name` and `main_billing_country_iso_3_per_deal` in `int_monthly_aggregated_metrics_history_by_deal`

* Adds the 2 new fields in the schema entry of `int_monthly_aggregated_metrics_history_by_deal`, including the dbt test not null in the deal name.

# 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/schema.yml

@@ -484,6 +484,19 @@ 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_dates_mtd_by_dimension
     description: |
       This model provides Month-To-Date (MTD) necessary dates, dimension and dimension_values