Regression: `TestBuilderContext.ObjectBag` no longer works, again

[aradalvand]

A regression — basically identical to #3079

ClassConstructorMetadata.TestBuilderContext.ObjectBag once again doesn't flow through to TestContext.StateBag.

You might also want to rename TestBuilderContext.ObjectBag to StateBag, for consistency's sake. I think this property may have been overlooked in general.

Minimal repro (nearly identical to the one in #3079):
Using TUnit version 1.0.0:

using System.Diagnostics.CodeAnalysis;
using TUnit.Core.Interfaces;

public sealed class ExampleConstructor : IClassConstructor
{
    public async Task<object> Create([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type type, ClassConstructorMetadata classConstructorMetadata)
    {
        classConstructorMetadata.TestBuilderContext.ObjectBag["FOO"] = "BAR";
        return new ExampleTestClass();
    }
}

public sealed class CustomListenersAttribute : Attribute, ITestStartEventReceiver
{
    public async ValueTask OnTestStart(TestContext context)
    {
        Console.WriteLine($"FOO: {context.StateBag["FOO"]}"); // THROWS
    }
}

[CustomListeners]
[ClassConstructor<ExampleConstructor>]
public sealed class ExampleTestClass()
{
    [Test]
    public async Task ExampleTest()
    {
        await Task.Delay(1000);
    }
}

This time, please consider adding a test for this so that such regressions are prevented in the future. Thanks.