Merged PR 4507: Added timestamp to a/b test model

# Description

Added timestamp to a/b test model to start the measures from the adequate date and time

# 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.

Added timestamp to a/b test model

Related work items: #27721

models/intermediate/core/int_core__ab_test_monitoring_guest_journey.sql

@@ -24,6 +24,7 @@ with
             id_verification_request,
             ab_test_name,
             variation,
+            first_appearance_at_utc,
             date(first_appearance_at_utc) as first_appearance_date_utc
         from int_core__ab_test_tracking_guest_journey
     ),
@@ -32,6 +33,7 @@ with
             abt.ab_test_name,
             abt.variation,
             abt.id_verification_request,
+            abt.first_appearance_at_utc,
             abt.first_appearance_date_utc,
             vr.verification_estimated_started_date_utc as verification_started_date_utc,
             vr.verification_estimated_completed_date_utc
@@ -49,6 +51,7 @@ select
     gjd.ab_test_name,
     gjd.variation,
     gjd.id_verification_request,
+    gjd.first_appearance_at_utc,
     gjd.first_appearance_date_utc,
     gjd.verification_started_date_utc,
     gjd.verification_completed_date_utc,
@@ -107,4 +110,4 @@ left join
         or upper(vp.verification_payment_type)
         in {{ checkin_cover_fees_verification_payment_type_items }}
     )
-group by 1, 2, 3, 4, 5, 6, 7
+group by 1, 2, 3, 4, 5, 6, 7, 8

models/intermediate/core/schema.yml

@@ -4719,6 +4719,15 @@ models:
         data_tests:
           - not_null
 
+      - name: first_appearance_at_utc
+        data_type: timestamp
+        description: |
+          Timestamp of the first Verification Request Feature Flag record created 
+          with the same verification request and A/B test name. Mostly for information 
+          purposes. Cannot be null.
+        data_tests:
+          - not_null
+
       - name: first_appearance_date_utc
         data_type: date
         description: |