Merged PR 5329: Refactor model var to global var

# Description

Pulls up the date var in `int_core__guest_product_payments_v2` into the global project (will soon be used in other models).

The name was also changed to something more descriptive for the purpose it will follow in the global project.

# 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.
- [X] 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: #30165

dbt_project.yml

@@ -68,6 +68,10 @@ vars:
   # New Dash First Invoicing Date. This is the first date considered for New Dash invoicing.
   "new_dash_first_invoicing_date": "'2024-12-31'"
 
+  # The timestamp of when the Guest Squad activated the Feature Flag that 
+  # activated the big bang refactor of the Guest Products logic.
+  "guest_products_feature_flag_activation_timestamp": "'2025-06-08T00:00:00Z'"
+
   # A distant future date to use as a default when cutoff values are missing.
   "end_of_time": "'2050-12-31'"
 

models/intermediate/core/int_core__guest_product_payments_v2.sql

@@ -1,5 +1,4 @@
 {% set check_in_cover_as_id_verification_payment = "5" %}
-{% set cut_off_date_check_in_cover_as_id_verification_payment = "'2025-06-08'" %}
 
 {{ config(materialized="table") }}
 with
@@ -8,7 +7,7 @@ with
         from {{ ref("stg_core__verification_to_payment") }}
         where
             created_date_utc
-            <= date({{ cut_off_date_check_in_cover_as_id_verification_payment }})
+            <= date({{ var("guest_products_feature_flag_activation_timestamp") }})
             and id_verification_payment_type
             = {{ check_in_cover_as_id_verification_payment }}
     ),
@@ -20,7 +19,7 @@ with
         from {{ ref("stg_core__verification") }}
         where
             created_date_utc
-            <= date({{ cut_off_date_check_in_cover_as_id_verification_payment }})
+            <= date({{ var("guest_products_feature_flag_activation_timestamp") }})
     ),
     stg_core__verification_request as (
         select * from {{ ref("stg_core__verification_request") }}