Add dbt project with an example of test with multiple parents

dev/dags/dbt/multiple_parents_test/dbt_project.yml

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+name: 'my_dbt_project'
+version: '1.0.0'
+config-version: 2
+
+profile: 'default'
+
+model-paths: ["models"]
+test-paths: ["tests"]
+
+models:
+  my_dbt_project:
+    materialized: view

dev/dags/dbt/multiple_parents_test/macros/custom_test_combined_model.sql

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+{% test custom_test_combined_model(model) %}
+WITH source_data AS (
+    SELECT id FROM {{ ref('model_a') }}
+),
+combined_data AS (
+    SELECT id FROM {{ model }}
+)
+SELECT
+    s.id
+FROM
+    source_data s
+LEFT JOIN
+    combined_data c
+    ON s.id = c.id
+WHERE
+    c.id IS NULL
+{% endtest %}

dev/dags/dbt/multiple_parents_test/models/combined_model.sql

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+-- Combine data from model_a and model_b
+WITH model_a AS (
+    SELECT * FROM {{ ref('model_a') }}
+),
+model_b AS (
+    SELECT * FROM {{ ref('model_b') }}
+)
+SELECT
+    a.id,
+    a.name,
+    b.created_at
+FROM
+    model_a AS a
+JOIN
+    model_b AS b
+    ON a.id = b.id

dev/dags/dbt/multiple_parents_test/models/model_a.sql

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+-- Create a simple table
+SELECT 1 AS id, 'Alice' AS name
+UNION ALL
+SELECT 2 AS id, 'Bob' AS name

dev/dags/dbt/multiple_parents_test/models/model_b.sql

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+-- Create another simple table
+SELECT 1 AS id, '2024-12-25'::date AS created_at
+UNION ALL
+SELECT 2 AS id, '2024-12-26'::date AS created_at

dev/dags/dbt/multiple_parents_test/models/schema.yml

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+version: 2
+
+models:
+  - name: model_a
+    description: "A simple model with user data"
+    tests:
+      - unique:
+          column_name: id
+
+  - name: model_b
+    description: "A simple model with date data"
+    tests:
+      - unique:
+          column_name: id
+
+  - name: combined_model
+    description: "Combines data from model_a and model_b"
+    columns:
+      - name: id
+        tests:
+          - not_null
+
+      - name: name
+        tests:
+          - not_null
+
+      - name: created_at
+        tests:
+          - not_null
+
+    tests:
+      - custom_test_combined_model: {}

dev/dags/dbt/multiple_parents_test/profiles.yml

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+default:
+  target: dev
+  outputs:
+    dev:
+      type: postgres
+      host: "{{ env_var('POSTGRES_HOST') }}"
+      user: "{{ env_var('POSTGRES_USER') }}"
+      password: "{{ env_var('POSTGRES_PASSWORD') }}"
+      port: "{{ env_var('POSTGRES_PORT') | int }}"
+      dbname: "{{ env_var('POSTGRES_DB') }}"
+      schema: "{{ env_var('POSTGRES_SCHEMA') }}"
+      threads: 4