Replace calls HttpStatusCode.Equals with direct comparison

[pbolduc]

This change replaces the use of HttpStatusCode.OK.Equals(statusCode) in favor of using the equals operator directly. Using the equals operator is around 26 - 3000 times faster depending on the processor. I tested on a Raspberry Pi 4b and am AMD Ryzen Threadripper PRO 3955WX. Consider the following benchmark,

    public class Benchmarks
    {
        private HttpStatusCode _statusCode;

        [GlobalSetup]
        public void Setup()
        {
            Random random = new Random(420);

            var values = Enum.GetValues(typeof(HttpStatusCode)).Cast<HttpStatusCode>().ToArray();
            for (int i = 0; i < 10; i++)
            {
                random.Shuffle(values);
            }
        }

        [Benchmark]
        public bool EqualsMethod()
        {
            return _statusCode.Equals(HttpStatusCode.OK);
        }

        [Benchmark(Baseline = true)]
        public bool EqualsOperator()
        {
            return _statusCode == HttpStatusCode.OK;
        }
    }

The results on Raspberry Pi 4,

BenchmarkDotNet v0.13.12, Debian GNU/Linux 12 (bookworm)
Unknown processor
.NET SDK 8.0.101
  [Host]     : .NET 8.0.1 (8.0.123.58001), Arm64 RyuJIT AdvSIMD
  DefaultJob : .NET 8.0.1 (8.0.123.58001), Arm64 RyuJIT AdvSIMD


| Method         | Mean       | Error     | StdDev    | Median     | Ratio | RatioSD |
|--------------- |-----------:|----------:|----------:|-----------:|------:|--------:|
| EqualsMethod   | 73.6396 ns | 0.4825 ns | 0.4277 ns | 73.5708 ns |     ? |       ? |
| EqualsOperator |  0.0197 ns | 0.0185 ns | 0.0164 ns |  0.0248 ns |     ? |       ? |

and the results on AMD Ryzen Threadripper PRO 3955WX,

BenchmarkDotNet v0.13.12, Windows 11 (10.0.22631.3085/23H2/2023Update/SunValley3)
AMD Ryzen Threadripper PRO 3955WX 16-Cores, 1 CPU, 32 logical and 16 physical cores
.NET SDK 8.0.200-preview.23624.5
  [Host]     : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT AVX2


| Method         | Mean      | Error     | StdDev    | Median    | Ratio | RatioSD |
|--------------- |----------:|----------:|----------:|----------:|------:|--------:|
| EqualsMethod   | 8.3323 ns | 0.1652 ns | 0.1545 ns | 8.2500 ns |     ? |       ? |
| EqualsOperator | 0.0027 ns | 0.0036 ns | 0.0034 ns | 0.0018 ns |     ? |       ? |

[ebozduman]

LGTM