[C++] Drop support for C++/CLI
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
We're caring about C++/CLI by not using `nullptr`/`` in public header. (But we don't have CI for C++/CLI.)
But it seems that there is no Arrow + C++/CLI user ( https://github.com/apache/arrow/pull/45674#issuecomment-2726294152 ) now. We have the C# implementation now. So we can drop support for C++/CLI.
### Component(s)
C++
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