Deprecated Authentication property from HttpContext removed in ASP.NET Core

## Deprecated Authentication property from HttpContext removed in ASP.NET Core

As part of aspnet/AspNetCore#6504 we've removed the deprecated Authentication property on HttpContext. The Authentication property has been deprecated since 2.0 and a [migration guide](https://docs.microsoft.com/en-us/aspnet/core/migration/1x-to-2x/identity-2x?view=aspnetcore-2.2#use-httpcontext-authentication-extensions) was published to migrate code using this deprecated property to the new replacement APIs. In addition, we have also removed all of the remaining unused classes/apis related to the old 1.x authentication stack in aspnet/AspNetCore@d7a7c65.

Please discuss this change on https://github.com/aspnet/AspNetCore/issues/6533

### Version introduced

3.0

### Old behavior

These APIs were available since 1.0 and were deprecated in 2.0.

### New behavior

These APIs have been removed in 3.0

### Reason for change

The old 1.0 APIs have been replaced by extension methods in the Microsoft.AspNetCore.Authentication namespace. The new API is documented [here](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.authentication.authenticationhttpcontextextensions?view=aspnetcore-2.2).

### Recommended action

The migration guide is available [here](https://docs.microsoft.com/en-us/aspnet/core/migration/1x-to-2x/identity-2x?view=aspnetcore-2.2#use-httpcontext-authentication-extensions).

### Category

- ASP.NET Core

### Affected APIs

[`HttpContext.Authentication`](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.http.httpcontext.authentication?view=aspnetcore-1.0)

```C#
// Classes
Microsoft.AspNetCore.Http.Authentication.AuthenticationManager
Microsoft.AspNetCore.Http.Authentication.AuthenticateInfo
Microsoft.AspNetCore.Http.Authentication.AuthenticationProperties
Microsoft.AspNetCore.Http.Features.Authentication.AuthenticateContext
Microsoft.AspNetCore.Http.Features.Authentication.ChallengeContext
Microsoft.AspNetCore.Http.Features.Authentication.ChallengeBehavior
Microsoft.AspNetCore.Http.Features.Authentication.DescribeSchemesContext
Microsoft.AspNetCore.Http.Features.Authentication.IAuthenticationHandler
Microsoft.AspNetCore.Http.Features.Authentication.SignInContext
Microsoft.AspNetCore.Http.Features.Authentication.SignOutContext

// Property
Microsoft.AspNetCore.Http.Features.Authentication.IHttpAuthenticationFeature.Handler property
```



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#### Issue metadata

* Issue type: breaking-change

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Deprecated Authentication property from HttpContext removed in ASP.NET Core #14732