Windows doesn't like it when the env has both a `PATH` and a `Path`, so `cloneEnv()` must remove `Path` after copying it to `PATH`.
Renamed the next builder `01-normalize-routes` test to `01-normalize-paths` as it's test normalization of output paths, then re-enabled the test for Windows.
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On Windows 10 and 11 machines, environment variables are not case sensitive. The system PATH is actually defined as `process.env.Path`, however Node.js kindly handles the case sensitivity and will automatically return the system path when specifying `process.env.PATH`.
When we clone the environment variables via `{ ...process.env }`, we lose the automatic resolving of `Path` to `PATH`. To fix this, we need to explicitly copy the `PATH`.
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