ZoneHVAC:HybridUnitaryHVAC - Check for ventilation-only setting before defaulting to standby

### Issue overview

When heating and cooling are not required, check for a better ventilation-only setting instead of defaulting to standby mode.

### Operating System (Multiple choices)

Any

### Operating System Version

Any

### Version of EnergyPlus

26.1

### Unmethours link or helpdesk ticket number

N/A

### Defect file

_No response_