Merged PR 3431: Adds Invoicing metrics

# Description

Same old story: includes all metrics coming from Xero.
Adds a daily model, monthly, mtd + monthly agg and mtd agg
A test to compare values new vs. old
AND fixes the issue I mentioned with the timestamp - an issue in the old KPIs.

# 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.
- [NA] 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: #23565

models/intermediate/cross/int_dates_by_deal.sql

@@ -16,7 +16,7 @@ select distinct
     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_dates d on d.date_day >= date(u.created_date_utc)
 inner join int_core__deal deal on deal.id_deal = u.id_deal
 where
     -- include only up-to yesterday