[corlib] Fix FileInfo.MoveTo with same name.

[corlib] Fix FileInfo.MoveTo with same name.

FileInfo.MoveTo was not moving a file from one directory to another when
the file name did not change.

Fixes #18361.

An ArgumentException when destFileName is an empty array was added,
otherwise FileInfoTest.MoveTo_DestFileName_Empty would fail. Both
Path.GetFullPath and File.Move throw similar exceptions but
MoveTo_DestFileName_Empty expects the one from File.Move so it was added
to this method.