[Python] Environment variables for PyArrow not needed anymore
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Component: Python
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
With the switch to scikit-build-core backend PyArrow now uses env vars from Arrow C++ and so the usage of pyarrow specific env vars, for example `PYARROW_WITH_GANDIVA`, is not needed anymore. I think these env vars can be removed from [Building PyArrow documentation](https://arrow.apache.org/docs/developers/python/building.html) and also from our CI and dev scripts.
### Component(s)
Python
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