### Godot version

4.0.3

### System information

Windows 10

### Issue description

When loading files from a `pck` generated by Godot, file paths must match the exact string path that they were packed in.

Usually when loading files using `FileAccess`, redundant `/`s will be handled correctly. For example, `res://my//path////here` will resolve to `res://my/path/here`. This is not true for `pck`s.

---

Assuming the default `icon.svg` file has been moved into a new directory at `res://assets/`

```gdscript
# This is valid
FileAccess.open("res://assets/icon.svg", FileAccess.READ)
# This is also valid
FileAccess.open("res://assets//////icon.svg", FileAccess.READ)
```

When loading from a `pck`, the path must match exactly.

```gdscript
var packer := PCKPacker.new()
packer.pck_start("res://test.pck")
packer.add_file("res://my//path/icon.svg", "res://assets/icon.svg")
packer.flush()

ProjectSettings.load_resource_pack("res://test.pck")

# This is valid
FileAccess.open("res://my//path/icon.svg", FileAccess.READ)

# This is not valid
FileAccess.open("res://my/path/icon.svg", FileAccess.READ)
# This is also not valid
FileAccess.open("res://my//path/////icon.svg", FileAccess.READ)
```

### Steps to reproduce

Create a `pck` file and start adding files.

Load the `pck` and try to access files with redundant `/`s (or with the correct number of `/`s, if the files were added with redundant `/`s).

### Minimal reproduction project

Available as a repo here: https://github.com/you-win/pck-loading-inconsistency

Available as a zip:
[pck_loading_inconsistency.zip](https://github.com/godotengine/godot/files/11525206/pck_loading_inconsistency.zip)

if (pd->parent) {
				pd = pd->parent;
			}
		} else if (pd->subdirs.has(p)) {
			pd = pd->subdirs[p];
		} else {
			return nullptr;
		}
	}
	return pd;
}
Error DirAccessPack::change_dir(String p_dir) {
	PackedData::PackedDir *pd = _find_dir(p_dir);
	if (pd) {
		current = pd;
		return OK;
	} else {
		return ERR_INVALID_PARAMETER;
	}
}
String DirAccessPack::get_current_dir(bool p_include_drive) const {
	PackedData::PackedDir *pd = current;
	String p = current->name;
	while (pd->parent) {
		pd = pd->parent;
		p = pd->name.path_join(p);
	}
	return "res://" + p;
}
bool DirAccessPack::file_exists(String p_file) {