Get Windows SDK path from Registry

[tusharsnx]

Summary of the Pull Request

The Windows SDK path may not be the same on all PCs, especially when Visual Studio (VS) is installed on a drive other than C:/. However, we can read the correct path from the Registry, which this PR does.

Validation Steps Performed

1. Install VS on E:/.
2. Build the solution and see it passes without erroring on accessing MakePri.exe.

[tusharsnx]

I realized it's important to mention why this is important: I've a DevDrive at "E:/", and I'm trying to keep all dev related tools and projects on that drive exclusively. Wish C++ tools were smart enough to know where to look, but until then, we'd need to do this ourselves.

[DHowett]

I think we have a few more of these, actually - makepri and makeappx are both used by powershell scripts. Would you mind having a look at the others?

[tusharsnx]

Unfortunately, I can't repro the issue locally. @DHowett Could you take a look?

[Ayush41]

I can raise PR solving the issue and passing the test case as well!

[DHowett]

/azp run

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