BuildInParallel=false needed for arm64 installers (vcxproj)

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

I needed to disable parallel builds for the installers due to what looks like issues around native up to date checks:

@dougbu asked for this issue to track why this was needed

> More generally, the problems you hit earlier indicate a wider problem w/ up-to-date (not fast up-to-date) checks in our native projects. The native project references shouldn't cause any rebuilds of the work done in earlier steps. Please file a fairly urgent issue to get to the root of this.

### Expected Behavior

_No response_

### Steps To Reproduce

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### Exceptions (if any)

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### .NET Version

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### Anything else?

_No response_