### 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)

ERR_FAIL_COND_V_MSG(file.is_null(), ERR_INVALID_PARAMETER, "File must be opened before use.");
	Ref<FileAccess> f = FileAccess::open(p_src, FileAccess::READ);
	if (f.is_null()) {
		return ERR_FILE_CANT_OPEN;
	}
	File pf;
	pf.path = p_file;
	pf.src_path = p_src;
	pf.ofs = ofs;
	pf.size = f->get_length();
	Vector<uint8_t> data = FileAccess::get_file_as_bytes(p_src);
	{
		unsigned char hash[16];
		CryptoCore::md5(data.ptr(), data.size(), hash);
		pf.md5.resize(16);
		for (int i = 0; i < 16; i++) {
			pf.md5.write[i] = hash[i];
		}
	}
	pf.encrypted = p_encrypt;
	uint64_t _size = pf.size;
	if (p_encrypt) { 
		if (_size % 16) { 
			_size += 16 - (_size % 16);
		}
		_size += 16; 
		_size += 8; 
		_size += 16; 
	}