Remove placeholder tests (#1183)

* Remove placeholder tests

* Move Reverse perf test to benchmarks project

---------

Co-authored-by: Wojciech Nagórski <[email protected]>

Author: Rob-Hague

src/Renci.SshNet.Benchmarks/Common/ExtensionsBenchmarks.cs

@@ -0,0 +1,27 @@
+using BenchmarkDotNet.Attributes;
+
+using Renci.SshNet.Common;
+
+namespace Renci.SshNet.Benchmarks.Common
+{
+    public class ExtensionsBenchmarks
+    {
+        private byte[]? _data;
+
+        [Params(1000, 10000)]
+        public int N;
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            _data = new byte[N];
+            new Random(42).NextBytes(_data);
+        }
+
+        [Benchmark]
+        public byte[] Reverse()
+        {
+            return _data.Reverse();
+        }
+    }
+}