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XR: Improve OpenXR instance management

This MR adds two features:

  • A new static function, vtkOpenXRManager::QueryInstanceVersion, that returns the OpenXR runtime version for given connection strategy. This function enables programs to get this version without instantiating a render window.
  • Small modification in vtkOpenXRManagerConnection::Initialize to reset the environment variable set by vtkOpenXRRemotingManagerConnection::Initialize. This enable dynamic switch between OpenXR remoting runtime and default OpenXR runtime.

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