Restore 3 test files to aab0035

Author: LiamHamsters

src/Ydb.Sdk/test/Ydb.Sdk.Ado.Tests/Value/YdbListTests.cs

@@ -47,7 +47,7 @@ private static async Task ExecAsTableAsync(
         await cmd.ExecuteNonQueryAsync();
     }
 
-    private new static async Task<int> CountAsync(YdbConnection conn, string table)
+    private static async Task<int> CountAsync(YdbConnection conn, string table)
     {
         await using var check = conn.CreateCommand();
         check.CommandText = $"SELECT COUNT(*) FROM {table}";