XHarness can't create iOS18 simulators with Xcode26 on the machine

[rmarinho]

Similar to. #1090 it seems that if a new Xcode26 on the machine when trying to create a simulator iOS-simulator-x64 it fails since we are requesting a iPhone-XS that is not supported on the latest iOS Runtime.

 [18:02:11.2377400] Running /Applications/Xcode_16.4.0.app/Contents/Developer/usr/bin/simctl create "iPhone Xs (iOS 26.0) - created by XHarness" com.apple.CoreSimulator.SimDeviceType.iPhone-XS com.apple.CoreSimulator.SimRuntime.iOS-26-0
[18:02:11.5741310] An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=403):
[18:02:11.5741900] Incompatible device
[18:02:11.5755120] Unable to create a device for device type: iPhone Xs (com.apple.CoreSimulator.SimDeviceType.iPhone-XS), runtime: iOS 26.0 (26.0 - 23A5297i) - com.apple.CoreSimulator.SimRuntime.iOS-26-0

it's calling simctl from Xcode 16.4
It's trying to use iPhone Xs, which is not compatible with iOS 26

[rmarinho]

cc @rolfbjarne @matouskozak @premun

[matouskozak]

We probably should update

xharness/src/Microsoft.DotNet.XHarness.iOS.Shared/Hardware/SimulatorSelector.cs

Line 39 in cbaa911

TestTarget.Simulator_iOS64 => "com.apple.CoreSimulator.SimDeviceType." + (minVersion ? "iPhone-6s" : "iPhone-XS"),

to something higher