Add nullable annotation to ResultContext<TOptions>.Result (#55948)

Author: joegoldman2

src/Security/Authentication/Core/src/Events/ResultContext.cs

@@ -43,7 +43,7 @@ public AuthenticationProperties Properties
     /// <summary>
     /// Gets the <see cref="AuthenticateResult"/> result.
     /// </summary>
-    public AuthenticateResult Result { get; private set; } = default!;
+    public AuthenticateResult? Result { get; private set; }
 
     /// <summary>
     /// Calls success creating a ticket with the <see cref="Principal"/> and <see cref="Properties"/>.

src/Security/Authentication/Core/src/PublicAPI.Unshipped.txt

@@ -1 +1,3 @@
 #nullable enable
+*REMOVED*Microsoft.AspNetCore.Authentication.ResultContext<TOptions>.Result.get -> Microsoft.AspNetCore.Authentication.AuthenticateResult!
+Microsoft.AspNetCore.Authentication.ResultContext<TOptions>.Result.get -> Microsoft.AspNetCore.Authentication.AuthenticateResult?