Changes to List spaces

added the optional property spaces/items/default_agent_runtime to the response with the 200 status

added the optional property spaces/items/default_llm_integration to the response with the 200 status

added the optional property spaces/items/gradient_end_color to the response with the 200 status

added the optional property spaces/items/gradient_start_color to the response with the 200 status

added the optional property spaces/items/ml_models_enabled to the response with the 200 status

added the optional property spaces/items/organization_id to the response with the 200 status

added the non-success response with the status 404

removed the non-success response with the status 403

api operation id spaces_list removed and replaced with list_spaces

added the required property spaces/items/is_private to the response with the 200 status