Dispose IServiceScope when window is destroyed to prevent memory leaks

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Description

This PR implements proper disposal of IServiceScope instances when windows are destroyed, addressing a memory leak where window-scoped services were never being disposed.

Problem

Currently, .NET MAUI creates window-scoped service scopes in MauiContextExtensions.MakeWindowScope() but never disposes them when the associated window is closed or destroyed. This leads to memory leaks for services registered with scoped lifetime.

The issue was marked with a TODO comment in the code:

// TODO: We need to dispose of these services once the window closes
scope = mauiContext.Services.CreateScope();

Solution

1. Added scope tracking to MauiContext: Added internal methods SetWindowScope() and DisposeWindowScope() to track the window-scoped service scope
2. Updated MakeWindowScope: Modified to store the created scope in the MauiContext for later disposal
3. Added disposal logic: Updated Window.Destroying() to dispose the scope before disconnecting the handler
4. Maintained API compatibility: Used internal methods to avoid breaking public API surface

Testing

Added comprehensive tests to verify:

• Service scopes are properly disposed when windows are destroyed
• Null safety when no scope is present
• Full integration with the window creation flow
• Scoped service lifetime behavior

All existing tests continue to pass (53 window-related tests ✅).

Example Usage

The fix is transparent to users - no code changes required. Services registered with scoped lifetime will now be properly disposed when windows are destroyed:

// Services registered like this will now be properly disposed
services.AddScoped<MyWindowScopedService>();

Fixes #8538.

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