WSL Sparse does not work at all.

### Windows Version

Microsoft Windows [Version 10.0.19045.4894]

### WSL Version

2.2.4.0

### Are you using WSL 1 or WSL 2?

- [X] WSL 2
- [ ] WSL 1

### Kernel Version

5.15.153.1-microsoft-standard-WSL2

### Distro Version

Ubuntu 22.04

### Other Software

_No response_

### Repro Steps

# Sparse does not work.
Ubuntu disk space (.vhdx file) shows ```118gbs``` in windows 10.
In Ubuntu: ```/ncdu / --exclude /mnt ``` shows ```64gbs```

Powershell(admin): ```notepad "$env:USERPROFILE/.wslconfig"```
.wslconfig:
```
[experimental]
sparseVhd=true
```
Powershell(admin):
```
wsl --list # list distros
wsl --manage --set-sparse true # enable sparse on vdisk
wsl --shutdown # restart wsl
wsl # restart wsl
```
Then when I check the size, it has not changed at all, still ```118gbs```.

# SOLUTION (MANUAL SHRINKING):
### for anyone who finds this in the future. Here is a way to resize the disk manually.
Powershell (admin):
```
FIRST BACKUP YOUR VHDX FILE
wsl --list # list distros
wsl --shutdown # Be patient and wait a bit for wsl to shutdown. It will eventually shutdown.
wsl --manage --set-sparse false
optimize-vhd -Path "" -Mode full
wsl --manage --set-sparse true
```
Then test if the VHDX file (wiztree) has shrunk and your distro can run.

### Expected Behavior

Reclaim disk space in Windows 10.

### Actual Behavior

The sparseVhd setting does not reclaim disk space in Windows 10.

### Diagnostic Logs

_No response_

Start by reproducing the reported Windows 10 behavior with .wslconfig's sparseVhd=true, then run the listed wsl --manage and wsl --shutdown commands and compare the VHDX size. Check whether the sparse setting actually reclaims space; done means the WSL VHDX shrinks while the distro remains usable.

Written by the indexing model from the issue text.