DirAccess does not give useful errors (even though there's supposed to be support for them)

### Tested versions

Tested and reproduced in 4.2.1.stable

### System information

Godot v4.2.1.stable - Windows 10.0.22631 - Vulkan (Forward+) - dedicated AMD Radeon RX 5700 XT (Advanced Micro Devices, Inc.; 31.0.24027.1012) - AMD Ryzen 5 2600 Six-Core Processor (12 Threads)

### Issue description

Essentially I was failing to get DirAccess working and I noticed that it _always_ throws @GlobalScope.FAILED aka Error 1.

### Steps to reproduce

Try to rename a file with
```gdscript
var path = YOUR_PATH_HERE
var from = FILE_NAME_AT_START
var to = FILE_NAME_AFTER_RENAME

var da = DirAccess.open(path)
da.rename(from, to)
```
but fail to rename the file, have an incorrect path or something that will throw an error, the error will ALWAYS be Error 1

### Minimal reproduction project (MRP)

[MRP_DirAccess_Error_Codes.zip](https://github.com/godotengine/godot/files/15227729/MRP_DirAccess_Error_Codes.zip)

Start at the DirAccess.rename entry point and reproduce the failures using the supplied MRP_DirAccess_Error_Codes.zip project. Compare the reported Error 1 result for an invalid path or failed rename, and define completion as returning useful, distinguishable errors for these cases.

Written by the indexing model from the issue text.