feat(pluggables): Add complete flow tests and logging for pluggables service

- Implemented logging for various services in dump_logs.sh.
- Activated pluggables component in ecoc26_deploy.sh.
- Added PluggablesClient fixture in Fixtuers.py for test sessions.
- Updated topology descriptor to use ecoc26_topo_devices_DSCM.json.
- Created Kubernetes job for pluggables complete-flow tests in pluggables_test_job.yaml.
- Developed script to run pluggables tests in Kubernetes environment.
- Added comprehensive tests for pluggables functionality in test_pluggable_complete_flow.py.
- Included real configuration XML templates for hub and leaf devices.
- Updated todo list with pluggables testing status and next steps.