### 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)

String nd = p_dir.replace("\\", "/");
	
	if (p_dir == "..") {
		return current->parent;
	}
	bool absolute = false;
	if (nd.begins_with("res://")) {
		nd = nd.replace_first("res://", "");
		absolute = true;
	}
	nd = nd.simplify_path();
	if (nd.is_empty()) {
		nd = ".";
	}
	if (nd.begins_with("/")) {
		nd = nd.replace_first("/", "");
		absolute = true;
	}
	Vector<String> paths = nd.split("/");
	PackedData::PackedDir *pd;
	if (absolute) {
		pd = PackedData::get_singleton()->root;
	} else {
		pd = current;
	}
	for (int i = 0; i < paths.size(); i++) {
		String p = paths[i];
		if (p == ".") {
			continue;
		} else if (p == "..") {