Allow more multistage heating coils in AFN

[lgu1234]

Pull request overview

• Fixes Allow more multistage heating coils for AFN model #10389
• DESCRIBE PURPOSE OF THIS PULL REQUEST

When multispeed heat pump is used in the AFN model, the allowed heating coil is DX heating coil and no multistage heating coils are allowed. The fix allows two more types heating coils in the AirflowNetwork:Distribution:Component:Coil:

  \key Coil:Heating:Electric:MultiStage
  \key Coil:Heating:Gas:MultiStage

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[lgu1234]

Allow two more multistage heating coils

[Myoldmopar]

This seems extremely straightforward. It does touch AFN, so I will ping @jasondegraw for comments, but it doesn't seem to really be doing anything controversial. If anyone has thoughts, speak up!

[Myoldmopar]

I pulled develop in and resolved the unit test conflict. It was just that two different unit tests were added to the bottom. Everything builds and passes fine. If no one has any additional comments, and this is fine on CI, I'll merge this today.

[Myoldmopar]

CI was all happy here, I'm merging this one in. Thanks @lgu1234