RCS1250 Does not offer 'Simplify Object Creation' for async Task<>/ValueTask<>

[John-Leitch]

RCS1250 is not offered in the following case:

namespace Foo;

internal class Program
{
    private static async Task<string> TestImplicitAsync()
    {
        return new [|string|](' ', 10);
    }

    private static void Main(string[] args)
    {
        Console.WriteLine("Hello, World!");
    }
}