Merged PR 3914: Include Hubspot deals for KPIs

# Description

Context: I'm intending to work on Account Managers reporting, that mostly will include reporting at Deal level the Resolutions Payouts as well as the new Retained metrics. While checking the great increase on Resolutions Payouts for October 2024:

![image (2).png](https://guardhog.visualstudio.com/4148d95f-4b6d-4205-bcff-e9c8e0d2ca65/_apis/git/repositories/54ac356f-aad7-46d2-b62c-e8c5b3bb8ebf/pullRequests/3914/attachments/image%20%282%29.png)

I decided to take a quick look into the main players... and surprise surprise we have Guesty:

![image.png](https://guardhog.visualstudio.com/4148d95f-4b6d-4205-bcff-e9c8e0d2ca65/_apis/git/repositories/54ac356f-aad7-46d2-b62c-e8c5b3bb8ebf/pullRequests/3914/attachments/image.png)

So Guesty represents 37k over the 73K of October. 50%. Not bad.

The main issue is that we've been aware for months now (since Churn efforts, mostly) that we're not reporting in KPIs those deals that are NOT created in Core. Most notably, API deals which includes... well, Guesty. So creating this kind of in-depth Account Managers improvement without reporting Guesty I think it would be very misleading. Note that the overall figures (Global dimension) are still accurate, though.

What's new:
* A new model named `int_kpis__dimension_deals` that basically retrieves Deals from both Core (as before) and Hubspot. It combines information from both and mostly assumes Hubspot as a better source of information than Core - although we do not have the Main Billing Country there afaik.
* Propagates changes, mostly in the monthly by deal view of Main KPIs. Here I confirm that now Guesty appears, and it only has metrics that come from Xero (APIs Revenue, Total Revenue, Resolutions, etc)

# 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: #25829

models/intermediate/core/int_core__deal.sql

@@ -79,7 +79,8 @@ select
     mbcpd.main_billing_country_iso_2_per_deal,
     mbcpd.main_billing_country_iso_3_per_deal,
     count(distinct uu.id_user) as users_with_this_id_deal,
-    count(distinct uu.billing_country_iso_3) as billing_countries_for_this_id_deal
+    count(distinct uu.billing_country_iso_3) as billing_countries_for_this_id_deal,
+    min(uu.created_date_utc) as first_created_date_utc
 from main_billing_country_per_deal mbcpd
 left join int_core__unified_user uu on uu.id_deal = mbcpd.id_deal
 left join unique_name_per_deal unpd on uu.id_deal = unpd.id_deal

models/intermediate/core/schema.yml

@@ -2839,6 +2839,11 @@ models:
         description: |
           Informative field of how many different billing countries are
           associated to this Deal based on the user account configuration.
+      - name: first_created_date_utc
+        data_type: date
+        description: |
+          First date corresponding to the user creation date for the users 
+          that have this Deal associated.
   - name: int_core__payaway
     description: |
       Contains all the PayAway plans, which are basically the settings for