ci: route build IO through Dev Drives#31357
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Why
Windows Cargo and Bazel jobs spend significant time in filesystem-heavy build and cache directories. Route those directories through one CI build root so Windows can use its Dev Drive and Unix can use a stable cache root.
What
setup-cidefineCI_BUILD_ROOT,CARGO_TARGET_DIR, Bazel cache/output paths, and temp paths.C:.Manual validation
just test-github-scripts.yq.Stack