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/Minds/MindTests.ReconnectTests.cs

@@ -1,4 +1,4 @@
-using System.Linq;
+using System.Linq;
 using Content.Shared.Ghost;
 using Content.Shared.Mind;
 using Robust.Server.Player;
@@ -127,7 +127,7 @@ public sealed partial class MindTests
         var mindSys = entMan.System<SharedMindSystem>();
         var mind = GetMind(pair);
 
-        Assert.Null(mind.Comp.VisitingEntity);
+        Assert.That(mind.Comp.VisitingEntity, Is.Null);
 
         // Make player visit a new mob
         var original = mind.Comp.OwnedEntity;
@@ -165,8 +165,8 @@ public sealed partial class MindTests
         await using var pair = await SetupPair();
         var mind = GetMind(pair);
 
-        Assert.Null(mind.Comp.VisitingEntity);
-        Assert.NotNull(mind.Comp.OwnedEntity);
+        Assert.That(mind.Comp.VisitingEntity, Is.Null);
+        Assert.That(mind.Comp.OwnedEntity, Is.Not.Null);
         var entity = mind.Comp.OwnedEntity;
 
         await pair.RunTicksSync(5);
@@ -175,7 +175,7 @@ public sealed partial class MindTests
 
         var newMind = GetMind(pair);
 
-        Assert.Null(newMind.Comp.VisitingEntity);
+        Assert.That(newMind.Comp.VisitingEntity, Is.Null);
         Assert.That(newMind.Comp.OwnedEntity, Is.EqualTo(entity));
         Assert.That(newMind.Id, Is.EqualTo(mind.Id));