chore: update fixtures scope that are loading data into the analytical db (#17780)

* Update db setup fixture scope

* Load data into db only once

* Update fixture scopes for data loading

* cleanup imports

* try import

* Update scope

* fix cleanup

* Import all fixtures

* Separate data log and metadata creation

* Retain table description

* fix dtype

Co-authored-by: Bogdan Kyryliuk <bogdankyryliuk@dropbox.com>

tests/integration_tests/utils_tests.py

@@ -26,6 +26,7 @@ from typing import Any, Tuple, List, Optional
 from unittest.mock import Mock, patch
 from tests.integration_tests.fixtures.birth_names_dashboard import (
     load_birth_names_dashboard_with_slices,
+    load_birth_names_data,
 )
 
 import numpy as np
@@ -81,6 +82,7 @@ from superset.views.utils import (
 from tests.integration_tests.base_tests import SupersetTestCase
 from tests.integration_tests.fixtures.world_bank_dashboard import (
     load_world_bank_dashboard_with_slices,
+    load_world_bank_data,
 )
 
 from .fixtures.certificates import ssl_certificate