Fixer/Analyzer: Suggest rewriting builder.Host.ConfigureServices to builder.Services

We should rewrite:

```C#
var builder = WebApplication.CreateBuilder(args);

builder.Host.ConfigureServices(services =>
{
    services.AddAntiforgery();
});

// OR

builder.WebHost.ConfigureServices(services =>
{
    services.AddAntiforgery();
});
```

To

```C#
var builder = WebApplication.CreateBuilder(args);

builder.Services.AddAntiforgery();
```