build.ps1: use pinned toolchain rather than built toolchain #85419
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Adjust the toolchain build to use the pinned toolchain rather than the built toolchain. This is particularly important with the lack of ABI stability on Windows. We now uniformly build the toolchain with the same runtime. This extricates the SDK from the toolchain build.
Now that we build the toolchain properly against a SxS installable version of the runtime, we can consume the runtime that we built against and inject that into the toolchain image. This avoids the need to rely on trying to maintain ABI compatibility in an ABI unstable environment.