Fix IDE warnings (#12010)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

test/testcases/conftest.py

@@ -131,6 +131,7 @@ def get_tenant_info(auth):
 
 @pytest.fixture(scope="session", autouse=True)
 def set_tenant_info(auth):
+    tenant_id = None
     try:
         add_models(auth)
         tenant_id = get_tenant_info(auth)