fix: avoid flaky workflow execution list test by comparing IDs (#2488)

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: trygveu

tests/tests_integration/test_api/test_workflows.py

@@ -577,8 +577,9 @@ def test_list_workflow_executions(
         listed = cognite_client.workflows.executions.list(
             workflow_version_ids=workflow_execution_list[0].as_workflow_id()
         )
-
-        unittest.TestCase().assertCountEqual(listed, workflow_execution_list)
+        # Compare by ID: cancel() can return before fields like end_time are
+        # finalized server-side, so full-object equality is flaky.
+        assert {e.id for e in listed} == {e.id for e in workflow_execution_list}
 
     def test_list_workflow_executions_by_status(
         self,