Replace manual ReferenceEquals with TUnit IsSameReferenceAs assertion

[Copilot]

A test in LocalStackProjectExtensionsTests used a manual ReferenceEquals() check with exception throwing, deviating from the TUnit assertion pattern used throughout the codebase.

Changed:

• Replaced manual reference equality check with TUnit's .IsSameReferenceAs() assertion
• Captured builder references outside the synchronous lambda to enable async assertion

Before:

var result = projectBuilder.WithReference(localStackBuilder: null);

if (!ReferenceEquals(result, projectBuilder))
{
    throw new InvalidOperationException("Builder should be the same reference");
}

After:

IResourceBuilder<ProjectResource>? capturedResult = null;
IResourceBuilder<ProjectResource>? capturedBuilder = null;

var (app, projectResource) = TestApplicationBuilder.CreateWithResource<ProjectResource>(/* ... */, builder =>
{
    var projectBuilder = builder.AddProject(/* ... */);
    capturedBuilder = projectBuilder;
    capturedResult = projectBuilder.WithReference(localStackBuilder: null);
});

await Assert.That(capturedResult).IsSameReferenceAs(capturedBuilder);

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