ApiDescriptionGroupCollectionProvider fails for controllers with parameter type Exception

### Description of the bug
If a controller method uses a parameter of type `System.Exception`, accessing `Microsoft.AspNetCore.Mvc.ApiExplorer.ApiDescriptionGroupCollectionProvider.ApiDescriptionGroups` allocates GBs of memory and seems to be in an infinite loop.

The same happens, if not the controller parameter itself, but one of its direct or nested properties is of type `System.Exception`.

### To Reproduce

Write a controller with an action that takes a System.Exception as parameter:

``` C#
[Route("[controller]/[action]")]
[ApiExplorerSettings(IgnoreApi = false, GroupName = nameof(TroublesController))]
public class TroublesController : Controller
{
public IActionResult TroublesMethod(Exception parameter)
{
return View();
}
}

```
Write a controller that displays a view to show the API description:

``` C#

public class HomeController : Controller
{
public IActionResult Index(
[FromServices] IApiDescriptionGroupCollectionProvider apiExplorer)
=> View(apiExplorer);
}

```

In the view that should display the API, access the ApiDescriptionGroups:

``` C#

@using Microsoft.AspNetCore.Mvc.ApiExplorer;
@model IApiDescriptionGroupCollectionProvider

// This will not return and consume lots of memory
@Model.ApiDescriptionGroups.Version

```

### Further technical details

ASP.NET Core Version:

ASP.NET Core 3.1

Output of `dotnet --info`:

.NET Core SDK (reflecting any global.json):
Version: 3.1.101
Commit: b377529961

Runtime Environment:
OS Name: Windows
OS Version: 10.0.17763
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.101\

Host (useful for support):
Version: 3.1.1
Commit: a1388f194c

.NET Core SDKs installed:
2.1.802 [C:\Program Files\dotnet\sdk]
3.1.101 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

IDE:

Microsoft Visual Studio Professional 2019
Version 16.4.5