refactor: Ensure Flask framework leverages the Flask-SQLAlchemy session (Phase II) (#26909)

tests/integration_tests/key_value/commands/fixtures.py

@@ -66,6 +66,5 @@ def key_value_entry() -> Generator[KeyValueEntry, None, None]:
 @pytest.fixture
 def admin() -> User:
     with app.app_context() as ctx:
-        session: Session = ctx.app.appbuilder.get_session
-        admin = session.query(User).filter_by(username="admin").one()
+        admin = db.session.query(User).filter_by(username="admin").one()
         return admin