Refactor the response format of session list query

### Main idea

As we've been supporting multi-node multi-container sessions since 21.09, we need to rearrange the response of the session list query. There are some reasons why we need to refactor the format.

- Several keys that don't use anymore (e.g. `rocm_util`, `cpu_util`, etc.) still remain and may cause misusage.
- Supporting multi-node environment, some keys need to be organized by container-wise, rather than session-wise. (e.g. status)
### Alternative ideas

_No response_

### Anything else?

_No response_

JIRA Issue: BA-206