Exceptions due to unsolicited connections from monitoring apps remain unmarked and are raised via UnobservedTaskException

[d-jagoda]

Hi we continue to see the following exception despite this fix 9c70847

System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (Remote connection sent preamble length of 1230262351, which is greater than maximum allowed size of 1024.) ---> System.InvalidOperationException: Remote connection sent preamble length of 1230262351, which is greater than maximum allowed size of 1024. at Orleans.Runtime.Messaging.ConnectionPreambleHelper.Read(ConnectionContext connection) in /_/src/Orleans.Core/Networking/ConnectionPreamble.cs:line 96 at Orleans.Runtime.Messaging.GatewayInboundConnection.RunInternal() in /_/src/Orleans.Runtime/Networking/GatewayInboundConnection.cs:line 110 at Orleans.Runtime.Messaging.Connection.Run() in /_/src/Orleans.Core/Networking/Connection.cs:line 87 --- End of inner exception stack trace ---ConnectionPreambleHelperConnectionPreambleGatewayInboundConnection

The reason for this is the Task managed by this TaskCompletionSource not being observed https://github.com/dotnet/orleans/blob/main/src/Orleans.Core/Networking/Connection.cs#L152

An easy fix would be to observe it as it was done by earlier fix.
_initializationTcs.Task.Ignore();

Happy to to raise a PR.

Thanks in advance