Removed SingleDuctAirTerminal Heat/Cool Rate/Energy variables

[Nigusse]

Pull request overview

• Fixes SingleDuctAirTerminal Heat/Cool Rate/Energy variables are no longer used #8161
• Removed single duct constant volume no reheat air terminal Heat/Cool Rate/Energy variables, associated calculations and updated unit tests

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[Nigusse]

@mjwitte I removed the member variables, associated calculations and modified unit tests. Run unit tests locally and all passed.

[mjwitte]

@Nigusse Looks good, except now there's an unused variable warning on the unit test. Once that's cleaned up, this can drop in.