fix: run the frappe scheduler outside lite and worker-pool benches

[mihir-kandoi]

Dev and supervisor benches start workers with plain frappe worker, which has no scheduler, so scheduled jobs never ran and the System Health Report showed "Process Not Found".

Adds a schedule process (frappe schedule) to those benches. Lite mode and systemd's worker pool already run the scheduler, so they are unchanged.

[greptile-apps]

Confidence Score: 5/5

[High risk] Adds scheduler process to production bench startup.

The PR appears safe to merge; no actionable issue was established.

_{Reviews (1) · Last reviewed commit: "test: cover the schedule process definit..."}