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/kpis/int_kpis__agg_monthly_invoiced_revenue.sql

@@ -0,0 +1,33 @@
+{% set dimensions = get_kpi_dimensions_per_model("INVOICED_REVENUE") %}
+
+{{
+    config(
+        materialized="table", unique_key=["end_date", "dimension", "dimension_value"]
+    )
+}}
+
+
+{% for dimension in dimensions %}
+    select
+        -- Unique Key --
+        start_date,
+        end_date,
+        {{ dimension.dimension }} as dimension,
+        {{ dimension.dimension_value }} as dimension_value,
+        -- Metrics --
+        sum(xero_booking_net_fees_in_gbp) as xero_booking_net_fees_in_gbp,
+        sum(xero_listing_net_fees_in_gbp) as xero_listing_net_fees_in_gbp,
+        sum(xero_verification_net_fees_in_gbp) as xero_verification_net_fees_in_gbp,
+        sum(xero_operator_net_fees_in_gbp) as xero_operator_net_fees_in_gbp,
+        sum(
+            xero_waiver_paid_back_to_host_in_gbp
+        ) as xero_waiver_paid_back_to_host_in_gbp,
+        sum(xero_e_deposit_net_fees_in_gbp) as xero_e_deposit_net_fees_in_gbp,
+        sum(xero_guesty_net_fees_in_gbp) as xero_guesty_net_fees_in_gbp,
+        sum(xero_apis_net_fees_in_gbp) as xero_apis_net_fees_in_gbp
+    from {{ ref("int_kpis__metric_monthly_invoiced_revenue") }}
+    group by 1, 2, 3, 4
+    {% if not loop.last %}
+        union all
+    {% endif %}
+{% endfor %}