Fix `time_triggers` and scheduling logic in Payroll

[webpiratt]

• move scheduler.worker to separated instance, now it runs together with payroll.worker - that means payroll.worker must be single instance (unscalable);
• time_triggers table and scheduling logic in payroll.worker needs to be fixed/changed. Currently it doesn't schedule for subsequent runs, also we have data duplication in case of policy changed, we must store only policyID on scheduler side;
• double check IsAlreadyProposed, seems it doesn't filter as expected;