Do half the work in GetManagedName

[Youssef1313]

Hopefully this is going to reduce these:

I need to benchmark before/after to double check though.

[Youssef1313]

BenchmarkRunner.Run<Bench>();

public class GivenMyTestScenario
{
    public void When_SomeComponent_IsWhatever_Should_DoSomething()
    {

    }
}

[Config(typeof(Config))]
[MemoryDiagnoser]
public class Bench
{
    private class Config : ManualConfig
    {
        public Config()
        {
            var job = Job.Default;
            AddJob(
                job.WithNuGet("Microsoft.TestPlatform.AdapterUtilities", "17.14.1").WithBaseline(true),
                job.WithNuGet("Microsoft.TestPlatform.AdapterUtilities", "18.0.0-preview-25412-05")
            );

            // add the percentage column
            SummaryStyle =
                BenchmarkDotNet.Reports.SummaryStyle.Default
                .WithRatioStyle(BenchmarkDotNet.Columns.RatioStyle.Percentage);
            Options |= ConfigOptions.DisableOptimizationsValidator | ConfigOptions.GenerateMSBuildBinLog;
        }
    }

    private static MethodInfo s_methodInfo = typeof(GivenMyTestScenario).GetMethod(nameof(GivenMyTestScenario.When_SomeComponent_IsWhatever_Should_DoSomething))!;

    [Benchmark]
    public (string?, string?, string?[]?) Benchmark()
    {
        ManagedNameHelper.GetManagedName(s_methodInfo, out var managedName, out var managedType, out var hierarcyValues);
        return (managedName, managedType, hierarcyValues);
    }
}

Method	Job	NuGetReferences	Mean	Error	StdDev	Median	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Benchmark	Job-ACPJEB	Microsoft.TestPlatform.AdapterUtilities 17.14.1	1,706.4 ns	136.50 ns	402.5 ns	1,527.5 ns	baseline		0.1926	0.0038	2.38 KB
Benchmark	Job-DRSSHX	Microsoft.TestPlatform.AdapterUtilities 18.0.0-preview-25412-05	892.8 ns	74.79 ns	220.5 ns	1,038.4 ns	-45%	34.3%	0.0963	0.0010	1.19 KB	-50%

[Youssef1313]

45% faster, 50% less memory :)

I think there is still much more to optimize in this helper though :)