Remove deleted argument to VisitSubkernelsAndSelf

[markples]

In dotnet/interactive#3563, the VisitSubkernelsAndSelf method (in src/Microsoft.DotNet.Interactive/KernelExtensions.cs) was updated to remove the recursive argument, which breaks XPlot:

     public static void VisitSubkernelsAndSelf(
         this Kernel kernel,
-        Action<Kernel> onVisit,
-        bool recursive = false)
+        Action<Kernel> onVisit)
     {
         if (kernel is null)

This should fix the binding, though I haven't built or tested anything yet.

Two possible issues:

• This should still be able to build against older versions of Microsoft.DotNet.Interactive because they had a default value for the deleted argument, but binaries will need to run against compatible versions because the signature of the call is explicit in the IL. Specifically, new XPlot won't work with old Interactive.
• New VisitSubkernelsAndSelf is only non-recursive, so this is a behavior change from before (which passed true).

[markples]

It looks like this might need changes similar to #172.

[jonsequitur]

You can also remove the binary dependency on .NET Interactive entirely using convention-based formatting. plotly/Plotly.NET#476 (comment)

[cartermp]

@markples @jonsequitur I'll see if I can give building and updating this thing a whirl this afternoon. It was painful to update all the things late last year in part due to the build dependencies, but it's likely different now.

[cartermp]

Okay, this is now in latest main alongside an update to packages, tfms, etc. I now need to remember how to log into nuget so I can actually update packages. Ugh.