SystemEvents.PowerModeChanged is not raised on suspend/resume on Surface Pro

### Description

When Surface Pro sleeps, the [SystemEvents.PowerModeChanged](https://learn.microsoft.com/en-us/dotnet/api/microsoft.win32.systemevents.powermodechanged) event is not raised

### Reproduction Steps

`SystemEvents.PowerModeChanged += (s, e) => Debug.WriteLine(e.Mode);`

### Expected behavior

Should print `Suspend` on Sleep

### Actual behavior

Prints 'Suspend' on Desktop
No output on Surface Pro

### Regression?

_No response_

### Known Workarounds

Use `PowerRegisterSuspendResumeNotification`

### Configuration

dotnet SDK 10.0.102
Windows 11 (10.0.26200)
x64

### Other information

WM_POWERBROADCAST doesn't work for laptops
https://learn.microsoft.com/en-us/windows/win32/power/wm-powerbroadcast

PowerRegisterSuspendResumeNotification is available on Windows 8+ which works as expected:
https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-registersuspendresumenotification

Start by tracing the implementation of SystemEvents.PowerModeChanged and how it handles WM_POWERBROADCAST. Compare that path with PowerRegisterSuspendResumeNotification, then run the provided reproduction on a Surface Pro. Done means the event reports Suspend during sleep and resume without regressing desktop behavior.

Scritto dal modello di indicizzazione a partire dal testo della issue.