'The requested operation requires elevation' when installing WSL as SYSTEM

Nobody has claimed this yet.

### Windows Version

Microsoft Windows [Version 10.0.26200.6584]

### WSL Version

0.0.0.0

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

- [x] WSL 2
- [ ] WSL 1

### Kernel Version

_No response_

### Distro Version

_No response_

### Other Software

_No response_

### Repro Steps

This issue occurs on a fresh Windows installation when carrying out the following steps;
- Run cmd as Administrator
- Use PSExec to run cmd as SYSTEM (psexec -s -i -cmd.exe)
- Verify cmd is running as SYSTEM (whoami returns nt authority\system)
- Run wsl install (in our use case, wsl.exe --install --no-distribution --web-download --enable-wsl1, but the same occurs when just running wsl.exe --install)

### Expected Behavior

WSL should install as expected.

### Actual Behavior

The error 'The requested operation requires elevation' is returned, and wsl.exe exits.

While it might seem odd to run wsl.exe --install as SYSTEM, this is required when using deployment tools such as ConfigMgr to deploy a working WSL installation to end users. Using PSExec to run cmd.exe as SYSTEM allows us to test wsl.exe in this situation, without using ConfigMgr.

### Diagnostic Logs

_No response_

Reproduce the failure by running PsExec to open cmd.exe as SYSTEM, then run wsl.exe --install or the reported --no-distribution --web-download --enable-wsl1 command. The issue names no source files or tests, so start by tracing the WSL installation path that handles SYSTEM elevation. Done means installation succeeds when invoked as SYSTEM without the elevation error.

Written by the indexing model from the issue text.