Merged PR 5215: Switch from 20th to 12th for invoicing cap

# Description

After a discussion with Nathan, the invoicing cycle has again been reduced by quite a few days.
We agreed to move the cap from 20th to 12th of the following month.

# 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.
- [ ] I have checked for DRY opportunities with other models and docs.
- [ ] 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: #30147

macros/is_date_before_12th_of_previous_month.sql

@@ -2,23 +2,23 @@
 This macro returns a boolean value for dates depending on the current day of the month
 
 Logic:
-- If today is the 20th or later of the current month:
+- If today is the 12th or later of the current month:
   - Returns **False** for all dates within the current month.
   - Returns **True** for dates before the current month.
-- If today is before the 20th:
+- If today is before the 12th:
   - Returns **False** for all dates within the current and previous month.
   - Returns **True** for dates before the previous month.
 
 */
-{% macro is_date_before_20th_of_previous_month(date) %}
+{% macro is_date_before_12th_of_previous_month(date) %}
     (
         case
-            -- If today is the 20th or later, only exclude current month
-            when extract(day from now()) >= 20
+            -- If today is the 12th or later, only exclude current month
+            when extract(day from now()) >= 12
             then
                 date_trunc('month', ({{ date }})::date)::date
                 < date_trunc('month', now())::date
-            -- If today is before the 20th, exclude both current and previous month
+            -- If today is before the 12th, exclude both current and previous month
             else
                 date_trunc('month', ({{ date }})::date)::date
                 < date_trunc('month', now() - interval '1 month')::date