Dependency update / fixes / skrungle bungle (#23745)

* Give .props files 2-space indents.

* Move to Central Package Management.

Allows us to store NuGet package versions all in one place. Yay!

* Update NuGet packages and fix code for changes.

Notable:

Changes to ILVerify.
Npgsql doesn't need hacks for inet anymore, now we need hacks to make the old code work with this new reality.
NUnit's analyzers are already complaining and I didn't even update it to 4.x yet.
TerraFX changed to GetLastSystemError so error handling had to be changed.
Buncha APIs have more NRT annotations.

* Remove dotnet-eng NuGet package source.

I genuinely don't know what this was for, and Central Package Management starts throwing warnings about it, so YEET.

* Remove Robust.Physics project.

Never used.

* Remove erroneous NVorbis reference.

Should be VorbisPizza and otherwise wasn't used.

* Sandbox fixes

* Remove unused unit test package references.

Castle.Core and NUnit.ConsoleRunner.

* Update NUnit to 4.0.1

This requires replacing all the old assertion methods because they removed them 🥲

* Oh so that's what dotnet-eng was used for. Yeah ok that makes sense.

* Add Robust.Analyzers.Test

* Update submodule

* commit to re-run CI

Content.IntegrationTests/Tests/Toolshed/ToolshedTest.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using System.Collections.Generic;
 using Content.IntegrationTests.Pair;
 using Content.Server.Administration.Managers;
@@ -38,7 +38,7 @@ public abstract class ToolshedTest : IInvocationContext
 
     protected virtual async Task TearDown()
     {
-        Assert.IsEmpty(_expectedErrors);
+        Assert.That(_expectedErrors, Is.Empty);
         ClearErrors();
     }