Including Elsa.Extensions in Program.cs causes Swagger to break

## Description
Swagger breaks when using Elsa 3.5.1 in .NET 8. Swagger displays "Failed to Load API definition" with the error "Fetch error: response status is 404 undefined". This appears to happen as soon as you add `using Elsa.Extensions` to your Program.cs file.

## Steps to Reproduce
To help us identify the issue more quickly, please follow these guidelines:

1. **Detailed Steps**: Install Elsa 3.5.1 to a project. Add `using Elsa.Extensions` to your Program.cs file. Launch your app and visit `/swagger`. The error will be displayed.

2. **Code Snippets**:

Program.cs:

```
using Elsa.Extensions;
using MyApp.Workflows;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
builder.Services.AddElsa(elsa =>
{
elsa.AddWorkflow();
});

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();
```

4. **Reproduction Rate**: Every time

## Expected Behavior
Swagger should load with all endpoints.

## Actual Behavior
Swagger instead displays "Failed to Load API definition" with the error "Fetch error: response status is 404 undefined"

## Screenshots

## Environment
- **Elsa Package Version**: 3.5.1
- **Operating System**: Windows 11 Enterprise

## Troubleshooting Attempts
I tried uninstalling the Elsa.Http package, but the issue still occurs. I also tried working from a completely fresh project based on the Web API Template in Visual Studio, and the issue still occurs. I also removed `builder.Services.AddElsa()` from Program.cs, and the issue still occurs (That is, `using Elsa.Extensions` is the only Elsa code in Program.cs).