`gix clone` sets `core.symlinks` to `false` on Windows even if globally `true` about gitoxide

[Byron]

The issue might originate here which is the only spot where it writes the local configuration.

It's a well-known limitation that in-memory configuration can't be written back yet, merely because I didn't work on the API for that yet, which also explains why it doesn't change.

However, this also means that gix_fs::Capabilities::probe() is unable to figure out that the filesystem supports symlinks on Windows, or in this particular situation.

Finally, another bug seems to be that it doesn't correctly pick up global configuration for this and is probably quite none-conforming with how Git does it.