This PR removes the deprecated Accelerator class and all related code from the Microsoft.Maui.Controls namespace, as it was marked obsolete for .NET 8 and the replacement KeyboardAccelerator class is fully available and working.

Changes Made

Removed Files

• src/Controls/src/Core/Accelerator.cs - The deprecated Accelerator class
• src/Controls/src/Core/AcceleratorTypeConverter.cs - The deprecated type converter
• src/Controls/docs/Microsoft.Maui.Controls/Accelerator.xml - Documentation file

Updated Files

• src/Controls/src/Core/Menu/MenuItem.cs - Removed obsolete:
  • AcceleratorProperty bindable property
  • GetAccelerator() static method
  • SetAccelerator() static method
• src/Controls/docs/Microsoft.Maui.Controls/MenuItem.xml - Removed obsolete documentation entries
• All PublicAPI.Shipped.txt files - Removed Accelerator API entries while preserving KeyboardAccelerator entries

Migration Path

Developers should use the KeyboardAccelerator class instead:

// Before (deprecated, now removed):
MenuItem.SetAccelerator(menuItem, "Ctrl+S");

// After (recommended):
menuItem.KeyboardAccelerators.Add(new KeyboardAccelerator 
{ 
    Modifiers = KeyboardAcceleratorModifiers.Ctrl, 
    Key = "S" 
});

Testing

• ✅ All existing tests pass (5279 total, 5249 succeeded, 30 skipped, 0 failed)
• ✅ Sample projects build and run successfully
• ✅ KeyboardAccelerator functionality remains fully intact
• ✅ No breaking changes to working code (only obsolete APIs removed)

Fixes #30256.

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