Merged PR 3272: Expose Churn Rates into Main KPIs

# Description

Exposes Churn Rates into Main KPIs, specifically Revenue Churn Rate, Bookings Churn Rate and Listings Churn Rate. This is based on the average approach.

Additionally, it adds these 3 metrics in the kpis_additive_metrics_per_dimension_are_consistent test.
Additionally, it removes from int_mtd_vs_previous_year_metrics the computation of the additive Churn Rates. The removal of further unused code will be handled in a separated PR.

# 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.
- [NA] 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: #22691

models/reporting/general/mtd_aggregated_metrics.sql

@@ -57,7 +57,20 @@ from int_mtd_aggregated_metrics
 */
 where
     (
-        -- Not show current + previous month if the metric depends on invoicing cycle
+        (
+            -- Not show current + previous month if the metric depends on invoicing
+            -- cycle
+            (
+                lower(metric) like '%total revenue%'
+                or lower(metric) like '%resolutions%'
+                or lower(metric) like '%invoiced%'
+                or lower(metric) like '%retained%'
+                or lower(metric) like '%damage host%'
+            )
+            and {{ is_date_before_previous_month("date") }}
+        )
+        -- Keep all history for the rest of metrics
+        or not
         (
             lower(metric) like '%total revenue%'
             or lower(metric) like '%resolutions%'
@@ -65,14 +78,6 @@ where
             or lower(metric) like '%retained%'
             or lower(metric) like '%damage host%'
         )
-        and {{ is_date_before_previous_month("date") }}
-    )
-    -- Keep all history for the rest of metrics
-    or not
-    (
-        lower(metric) like '%total revenue%'
-        or lower(metric) like '%resolutions%'
-        or lower(metric) like '%invoiced%'
-        or lower(metric) like '%retained%'
-        or lower(metric) like '%damage host%'
     )
+    -- If metric is Churn Rate, do not show month in progress
+    and not (lower(metric) like '%churn rate%' and is_current_month = 1)