[Repo Assist] fix: use TcpListener(0) and StartAsync in XmlExtensions tests to avoid Windows CI failures

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Root Cause

On Windows CI, XmlExtensions.fs tests were intermittently failing with:

System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.

This error (WSAEACCES) occurs when Kestrel tries to bind a port that is in a Windows excluded port range — ranges reserved by Hyper-V, Docker, or Windows services. These excluded ports are not visible via IPGlobalProperties.GetActiveTcpListeners(), so the previous random-port approach would pick such a port, consider it "free", and then fail at the Kestrel bind step.

Fix

Two changes to startXmlHttpLocalServer() in tests/FSharp.Data.Core.Tests/XmlExtensions.fs:

1. TcpListener(0) port selection (like Http.fs already does)

Before (flawed random approach):

let freePort =
    let random = new System.Random()
    let mutable port = random.Next(10000, 65000)
    while
        IPGlobalProperties.GetIPGlobalProperties().GetActiveTcpListeners()
        |> Array.map (fun x -> x.Port)
        |> Array.contains port do
            port <- random.Next(10000, 65000)
    port

After (OS-assigned port, never excluded):

let freePort =
    let listener = new TcpListener(System.Net.IPAddress.Loopback, 0)
    listener.Start()
    let port = (listener.LocalEndpoint :?> System.Net.IPEndPoint).Port
    listener.Stop()
    port

Asking the OS to bind port 0 lets the kernel pick a port from the dynamic range, guaranteeing it is not in any excluded range.

2. StartAsync() instead of RunAsync() + Thread.Sleep(100)

Before: app.RunAsync(baseAddress) is fire-and-forget; each test then called Thread.Sleep(100) hoping the server started.

After: app.StartAsync() returns only after the server is listening, making readiness deterministic and removing 13 Thread.Sleep(100) calls.

Evidence

The failure was observed in workflow run 25557443533 on the build-windows job. Http.fs already used TcpListener(0) and was not affected.

Test Status

Passed! - Failed: 0, Passed: 13, Skipped: 0, Total: 13, Duration: 1 s

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