Using request timeouts middleware in web API

A revisit of an earlier approach to limiting a REST API endpoint's response time while allowing processing to continue in the background. The original hand-rolled solution used a CancellationTokenSource plus a parallel Task.Delay to enforce a timeout. This version replaces that with ASP.NET Core's built-in request timeouts middleware (available since .NET 8), hooking into HttpContext.RequestAborted and using Task.WaitAsync with the request's cancellation token, removing the need for a separately configured delay value. Includes setup code (AddRequestTimeouts, UseRequestTimeouts, RequestTimeout attribute) and a link to a sample GitHub repository with tests covering completion, abort, and background-continuation scenarios.

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