Register workflow with override=true still generates a 409 error

[andyren0110]

If we look at how the Java SDK is implemented,

    public boolean registerWorkflow(WorkflowDef workflowDef, boolean overwrite) {
        try {
            if (overwrite) {
                metadataClient.updateWorkflowDefs(Arrays.asList(workflowDef));
            } else {
                metadataClient.registerWorkflowDef(workflowDef);
            }
            return true;
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
            return false;
        }
    }

In contrast, for Python SDK, the overwrite flag is just passed to the backend and calls registerWorkflow regardless. However, the backend of registerWorkflow does not really handle override.