[C++] Substrait test fails in CI due to invalid path
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Component: C++
Type: bug
- Dominant language
- C++
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Description
### Describe the bug, including details regarding any error messages, version, and platform.
As noted in https://github.com/apache/arrow/pull/47455#issuecomment-3234664999, the substrait test fails to properly read the `PARQUET_TEST_DATA` environment variable set in CI and parse it into a valid file path. It appears that the forward slashes are inadvertantly dropped
### Component(s)
C++
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