Merged PR 3387: Adds Guest Payments metrics

# Description

Adds Guest Payments metrics, namely:
* deposit_fees_in_gbp
* waiver_payments_in_gbp
* checkin_cover_fees_in_gbp
* total_guest_payments_in_gbp

It includes:
* Daily model
* Monthly/MTD without dimension aggregates
* Monthly/MTD with dimension aggregates
* Schema entries for the abovementioned 5 models
* Temporary test to compare the different metrics against current production 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: #23453

models/intermediate/kpis/int_kpis__aggregated_monthly_guest_payments.sql

@@ -0,0 +1,27 @@
+{% set dimensions = get_kpi_dimensions_per_model("GUEST_PAYMENTS") %}
+
+{{
+    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(deposit_fees_in_gbp) as deposit_fees_in_gbp,
+        sum(waiver_payments_in_gbp) as waiver_payments_in_gbp,
+        sum(checkin_cover_fees_in_gbp) as checkin_cover_fees_in_gbp,
+        sum(total_guest_payments_in_gbp) as total_guest_payments_in_gbp
+    from {{ ref("int_kpis__metric_monthly_guest_payments") }}
+    group by 1, 2, 3, 4
+    {% if not loop.last %}
+        union all
+    {% endif %}
+{% endfor %}