ResourceUrlAnnotation.DisplayOrder is a field, not a property

https://github.com/dotnet/aspire/blob/17b639949da697093d4320782f24c8190f6f9761/src/Aspire.Hosting/ApplicationModel/ResourceUrlAnnotation.cs#L29-L32

	/// <summary>
	/// The display order the URL. Higher values mean sort higher in the list.
	/// </summary>
	public int? DisplayOrder;

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