Implement end-to-end GitHub Actions runner support with provisioning,
tracking, and cleanup flows.
- handle `workflow_job` webhooks to provision and tear down runners
- add runner config/execution models, enum states, and relationships
- create jobs for provisioning, cleanup, and stale-runner reaping
- schedule periodic stale runner cleanup in the console kernel
- add Livewire server UI to manage runner configuration and executions
- store GitHub App runner permissions and runner group metadata
- add migrations for runner permissions, configs, executions, and group id
- update GitHub permissions URL generation for organization app settings
- include feature/unit tests for runner behavior and permission paths
