Make sure to release connection lock (#11049)

src/SignalR/clients/csharp/Client.Core/src/HubConnection.cs

@@ -1942,12 +1942,14 @@ namespace Microsoft.AspNetCore.SignalR.Client
                 return _connectionLock.Wait(0);
             }
 
+            // Don't call this method in a try/finally that releases the lock since we're also potentially releasing the connection lock here.
             public async Task<ConnectionState> WaitForActiveConnectionAsync(string methodName, [CallerMemberName] string memberName = null, [CallerFilePath] string filePath = null, [CallerLineNumber] int lineNumber = 0)
             {
                 await WaitConnectionLockAsync(methodName);
 
                 if (CurrentConnectionStateUnsynchronized == null || CurrentConnectionStateUnsynchronized.Stopping)
                 {
+                    ReleaseConnectionLock(methodName);
                     throw new InvalidOperationException($"The '{methodName}' method cannot be called if the connection is not active");
                 }
 

src/SignalR/clients/csharp/Client/test/FunctionalTests/HubConnectionTests.cs

@@ -770,7 +770,6 @@ namespace Microsoft.AspNetCore.SignalR.Client.FunctionalTests
         }
 
         [Theory]
-        [Flaky("https://github.com/aspnet/AspNetCore-Internal/issues/2465", FlakyOn.All)]
         [MemberData(nameof(HubProtocolsAndTransportsAndHubPaths))]
         [LogLevel(LogLevel.Trace)]
         public async Task CanCancelIAsyncEnumerableClientToServerUpload(string protocolName, HttpTransportType transportType, string path)