Merged PR 3047: Override migration date with join date if join date is after migration date

# Description

Quick fix to make lower_limit_migration_date_utc more robust for new dash reporting purposes. I noticed some cases in which users were actually created after the migration date. In these cases, I just keep joined date.

# 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: #22331

models/intermediate/core/int_core__user_migration.sql

@@ -3,6 +3,7 @@
 {{ config(materialized="table") }}
 with
     stg_core__claim as (select * from {{ ref("stg_core__claim") }}),
+    stg_core__user as (select * from {{ ref("stg_core__user") }}),
 
     user_migration_from_claim as (
         select
@@ -56,11 +57,18 @@ with
 -- the date corresponding to the claim with more priority will be selected. The lower
 -- the claim_enforcement_priority, the more priority it will have. If still 2 claims
 -- have the same priority, select the earliest date.
+-- Lastly, the migrated date is overridden with the user joined date only if the user
+-- was actually created after the expected migration date.
 select
-    id_user_host,
+    c.id_user_host,
-    migration_phase,
+    c.migration_phase,
-    lower_limit_migration_date_utc,
+    greatest(
-    claim_enforcement_priority
+        c.lower_limit_migration_date_utc, u.joined_date_utc
+    ) as lower_limit_migration_date_utc,
+    c.claim_enforcement_priority,
+    case
+        when u.joined_date_utc > c.lower_limit_migration_date_utc then true else false
+    end as is_overridden_with_joined_date
 from
     (
         select
@@ -74,5 +82,6 @@ from
                     claim_enforcement_priority asc, lower_limit_migration_date_utc asc
             ) as rank
         from user_migration_from_claim
-    )
+    ) c
+inner join stg_core__user u on c.id_user_host = u.id_user
 where rank = 1

models/intermediate/core/schema.yml

@@ -2528,6 +2528,17 @@ models:
           this date.
         tests:
           - not_null
+      - name: claim_enforcement_priority
+        data_type: integer
+        description: |
+          Informative field. It just states which claim enforcement priority 
+          has been used for the computation.
+      - name: is_overridden_with_joined_date
+        data_type: boolean
+        description: |
+          Informative field. Boolean to indicate if the expected migration date 
+          based in the logic is finally overridden with the user joined date 
+          in case the user was created after the expected migration date.
 
   - name: int_core__address_validations
     description: