AspNetCore worker extension throwing task already completed exception

### Description

This came out of 4.1038 release validation that some of the apps were throwing following exception -

```csharp
Microsoft.Azure.WebJobs.Host.FunctionInvocationException : Exception while executing function: Functions.UserTournamentChallengeAsync ---> Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcException : Result: Failure
Exception: An attempt was made to transition a task to a final state when it had already completed.
Stack:
at Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.DefaultHttpCoordinator.SetFunctionContextAsync(String invocationId, FunctionContext context) in /mnt/vss/_work/1/s/extensions/Worker.Extensions.Http.AspNetCore/src/Coordinator/DefaultHttpCoordinator.cs:line 48
```

The function apps were not down and triggers were executing successfully. This error was noticed intermittently followed by below Host logs. Looks like a race condition.

```
The function invocation failed to proxy the request with ForwarderError: RequestCanceled
The client disconnected while the function was processing the request.
```

Teams thread for reference - [Link](https://teams.microsoft.com/l/message/19:e44959e7f62849c4a45e1cd43d607448@thread.tacv2/1744063499538?tenantId=72f988bf-86f1-41af-91ab-2d7cd011db47&groupId=201c2bb2-812d-4986-ac92-9bfad0d6cc59&parentMessageId=1744063499538&teamName=Azure%20Functions%20Team&channelName=Release%20-%20Announcements%20and%20Process&createdTime=1744063499538)

Start in extensions/Worker.Extensions.Http.AspNetCore/src/Coordinator/DefaultHttpCoordinator.cs at SetFunctionContextAsync, line 48, and review the related invocation and request-cancellation flow. Use the reported task-already-completed exception and Host ForwarderError: RequestCanceled logs as the failure case; done means the intermittent race no longer produces that exception during client disconnects.

Written by the indexing model from the issue text.