Integrate Kueue Information into Workload Listing (Optional)

# Integrate Kueue Information into Workload Listing

## Objective
Enhance the workload listing feature to include information about queued jobs from Kueue.

## User Stories
As a user, I want to:
* See information about both running and queued jobs in the workload list

## Requirements
1. Extend the `/jobs/list` backend API to query Kueue custom resources
2. Include queued job information in the API response
3. Update the `jobby list` CLI command to display queued job information
4. Add filtering options to include/exclude queued jobs in both the API and CLI

## Example Usage
API: `GET /jobs/list?include_queued=true`
CLI: `jobby list --include-queued`

## Note
This enhancement should be implemented in a way that maintains backwards compatibility with the basic workload listing functionality. Consider adding a new parameter to the `/jobs/list` endpoint and a new flag to the CLI command to optionally include queued jobs.