Minimal fix for missed pointerup after drug in Safari (JetBrains#3011)

This is the most possible non-invasive way to fix the bug that exists in
safari with processing pointer events after drag cancellation

## Testing
manual 

## Release Notes
### Fixes - Web
- [CMP-10102](https://youtrack.jetbrains.com/issue/CMP-10102) [Web]
Safari. DragAndDrop. After performing drag and drop operations buttons
are unclickable on the first attempt

Author: Schahen

compose/mpp/demo/src/webMain/kotlin/androidx/compose/mpp/demo/components/DragAndDropExample.web.kt

@@ -67,7 +67,7 @@ import androidx.compose.ui.text.input.TextFieldValue
 actual fun DragAndDropExample() {
     val exportedText = "Hello, DnD!"
 
-    var isTargetEnabled by remember { mutableStateOf(false) }
+    var isTargetEnabled by remember { mutableStateOf(true) }
 
 
     Box(

compose/ui/ui/src/webMain/kotlin/androidx/compose/ui/window/ComposeWindowInternal.web.kt

@@ -376,6 +376,7 @@ internal class ComposeWindow(
     }
 
     private fun initEvents(canvas: HTMLCanvasElement) {
+
         listOf(
             "pointerenter",
             "pointerdown",
@@ -387,6 +388,12 @@ internal class ComposeWindow(
             addTypedEvent<PointerEvent>(name, passive = false) { onPointerEvent(it) }
         }
 
+        state.globalEvents.addDisposableEvent("dragend") {
+            // in Safari pointerup event is not firing when we drop or cancel drop
+            // see https://youtrack.jetbrains.com/issue/CMP-10102
+            actualActivePointerButtons = null
+        }
+
         addTypedEvent<TouchEvent>("touchstart") { evt ->
             // in most cases we don't care about touches since in Compose we do not process them at all
             // there's one case however when we need to cancel them - it's when we are focussed in a DOM backing field