[HttpClient] Fix handling timeouts when responses are destructed #42894
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Spotted while giving a workshop on HttpClient at WebSummerCamp:
When responses are destructed, the timeout is counted from the call to the destructor. This means that when 10 concurrent requests are destructed and they all timeout, the code waits for
10 * $timeout
before giving back control.This PR fixes it by counting the timeouts from the first timeout when they happen in chain on destruction.