This PR updates the coder port-forward command to periodically inform coderd that the workspace is being used:
- Adds workspaceusage.Tracker which periodically batch-updates workspace LastUsedAt
- Adds coderd endpoint to signal workspace usage
- Updates coder port-forward to periodically hit this endpoint
- Modifies BatchUpdateWorkspacesLastUsedAt to avoid overwriting with stale data
Co-authored-by: Danny Kopping <danny@coder.com>