Fix accidental obsolete (#22065)

Author: BrennanConroy

src/SignalR/server/Core/ref/Microsoft.AspNetCore.SignalR.Core.netcoreapp.cs

@@ -188,8 +188,7 @@ public HubInvocationContext(Microsoft.AspNetCore.SignalR.HubCallerContext contex
         public Microsoft.AspNetCore.SignalR.Hub Hub { [System.Runtime.CompilerServices.CompilerGeneratedAttribute] get { throw null; } }
         public System.Reflection.MethodInfo HubMethod { [System.Runtime.CompilerServices.CompilerGeneratedAttribute] get { throw null; } }
         public System.Collections.Generic.IReadOnlyList<object> HubMethodArguments { [System.Runtime.CompilerServices.CompilerGeneratedAttribute] get { throw null; } }
-        [System.ObsoleteAttribute("This property is obsolete and will be removed in a future version. Use HubMethod.Name instead.")]
-        public string HubMethodName { [System.Runtime.CompilerServices.CompilerGeneratedAttribute] get { throw null; } }
+        public string HubMethodName { get { throw null; } }
         public System.IServiceProvider ServiceProvider { [System.Runtime.CompilerServices.CompilerGeneratedAttribute] get { throw null; } }
     }
     public sealed partial class HubLifetimeContext

src/SignalR/server/Core/src/HubInvocationContext.cs

@@ -31,10 +31,6 @@ public HubInvocationContext(HubCallerContext context, IServiceProvider servicePr
             HubMethod = hubMethod;
             HubMethodArguments = hubMethodArguments;
             Context = context;
-
-#pragma warning disable CS0618 // Type or member is obsolete
-            HubMethodName = HubMethod.Name;
-#pragma warning restore CS0618 // Type or member is obsolete
         }
 
         /// <summary>
@@ -68,8 +64,7 @@ internal HubInvocationContext(ObjectMethodExecutor objectMethodExecutor, HubCall
         /// <summary>
         /// Gets the name of the Hub method being invoked.
         /// </summary>
-        [Obsolete("This property is obsolete and will be removed in a future version. Use HubMethod.Name instead.")]
-        public string HubMethodName { get; }
+        public string HubMethodName => HubMethod.Name;
 
         /// <summary>
         /// Gets the arguments provided by the client.

src/SignalR/server/SignalR/test/HubConnectionHandlerTests.cs

@@ -2233,9 +2233,7 @@ public Task HandleAsync(AuthorizationHandlerContext context)
                 Assert.NotNull(context.Resource);
                 var resource = Assert.IsType<HubInvocationContext>(context.Resource);
                 Assert.Equal(typeof(MethodHub), resource.Hub.GetType());
-#pragma warning disable CS0618 // Type or member is obsolete
                 Assert.Equal(nameof(MethodHub.MultiParamAuthMethod), resource.HubMethodName);
-#pragma warning restore CS0618 // Type or member is obsolete
                 Assert.Equal(2, resource.HubMethodArguments?.Count);
                 Assert.Equal("Hello", resource.HubMethodArguments[0]);
                 Assert.Equal("World!", resource.HubMethodArguments[1]);