tests/unit_tests: sync unit tests after model changes (error_code field)

Recent changes [0] to the model caused unit tests to get out-of-sync
with its new state.

This results in false positive CI workflow failures [1] which were not
caused by the code introduced in the PR.

[0] kernelci/kernelci-core#2348
[1] https://github.com/kernelci/kernelci-api/actions/runs/7827783619/job/21356327252?pr=473

Fixes: kernelci#476

Signed-off-by: Paweł Wieczorek <[email protected]>

tests/unit_tests/test_node_handler.py

@@ -69,6 +69,7 @@ def test_create_node_endpoint(mock_db_create, mock_publish_cloudevent,
         'created',
         'data',
         'debug',
+        'error_code',
         'group',
         'holdoff',
         'kind',
@@ -221,6 +222,7 @@ def test_get_node_by_id_endpoint(mock_db_find_by_id,
         'created',
         'data',
         'debug',
+        'error_code',
         'group',
         'holdoff',
         'kind',