Schema has incorrect PublicKey metadata for InternalsVisibleTo items

[mhutch]

The schema currently offers completion for PublicKey metadata on InternalsVisibleTo items. This was added in #6778.

However, this is incorrect as the metadata for setting the public key is named Key (dotnet/sdk#3439).

It may be better to leave the schema as-is and have the item respect PublicKey metadata for consistency with the PublicKey property, as suggested in dotnet/sdk#13289 (comment).

[rainersigwald]

@marcpopMSFT got a preference here?

[marcpopMSFT]

So it was supposed to be PublicKey originally but was done as Key instead and the question is whether to update the Schema to point at Key or supported PublicKey? I think adding support for PublicKey makes slightly more sense to me as it may be what folks expect.

[Forgind]

PublicKey support added by dotnet/sdk#25000