Backport NKG unique names

[kbevers]

Backport of #4098 and 92de8aa. I guess this could be omitted since the name consistency checks have not been backported (yet?) but it may as well be kept up to date.

@rouault let me know if you disagree with this backport.

[rouault]

I'm fine with this backport

[kbevers]

The windows builds aren't though. Safe to merge anyways? Doesn't seem to be related to this change

[jjimenezshaw]

The windows builds aren't though. Safe to merge anyways? Doesn't seem to be related to this change

I mentioned it already a few days ago: https://lists.osgeo.org/pipermail/proj/2024-April/011342.html
It is not related with your changes. But we do not have any windows MSVC CI running in case there is a problem there.

[rouault]

But we do not have any windows MSVC CI running in case there is a problem there.

hopefully the vcpkg folks will figure out soon a clean solution, although the situation in their bug tracker is confusing, with people keeping opening issues about that (microsoft/vcpkg#37962, microsoft/vcpkg#37970), and being pointed to the workaround of microsoft/vcpkg#37962 (comment)
anyway nothing MSVC specific in this PR, merging