fix(ScrollBar): use large scroll events for ScrollToHome and ScrollToEnd (#21748)

* fix(ScrollBar): use large scroll events for ScrollToHome and ScrollToEnd

* Fix failing test

---------

Co-authored-by: Tim <47110241+timunie@users.noreply.github.com>

src/Avalonia.Controls/Primitives/ScrollBar.cs

@@ -579,7 +579,7 @@ namespace Avalonia.Controls.Primitives
         public void ScrollToHome()
         {
             SetCurrentValue(ValueProperty, Minimum);
-            OnScroll(ScrollEventType.SmallDecrement);
+            OnScroll(ScrollEventType.LargeDecrement);
         }
 
         /// <summary>
@@ -588,7 +588,7 @@ namespace Avalonia.Controls.Primitives
         public void ScrollToEnd()
         {
             SetCurrentValue(ValueProperty, Maximum);
-            OnScroll(ScrollEventType.SmallIncrement);
+            OnScroll(ScrollEventType.LargeIncrement);
         }
 
         /// <summary>

tests/Avalonia.Controls.UnitTests/Primitives/ScrollBarTests.cs

@@ -338,8 +338,8 @@ namespace Avalonia.Controls.UnitTests.Primitives
                 {
                     ScrollEventType.SmallIncrement,
                     ScrollEventType.LargeIncrement,
-                    ScrollEventType.SmallDecrement,
-                    ScrollEventType.SmallIncrement,
+                    ScrollEventType.LargeDecrement,
+                    ScrollEventType.LargeIncrement,
                 },
                 events);
         }