[cdac] Remove extra [] in array type name (#106662)

We were appending an extra `[]` to the end of the type name for multi-dimensional or non-zero-based arrays.

src/native/managed/cdacreader/src/Legacy/TypeNameBuilder.cs

@@ -594,7 +594,6 @@ private void AddArray(uint rank)
             }
             TypeString.Append(']');
         }
-        TypeString.Append("[]");
     }
 
     private static ReadOnlySpan<char> TypeNameReservedChars()