Fix muted ScrollableTest for iOS target (JetBrains#2711)

Fixes
https://youtrack.jetbrains.com/issue/CMP-8401/Fix-ScrollableTest-fling-tests

## Release Notes
N/A

Author: ASalavei

compose/foundation/foundation/src/skikoTest/kotlin/androidx/compose/foundation/copyPasteAndroidTests/ScrollableTest.kt

@@ -81,6 +81,7 @@ import androidx.compose.runtime.currentComposer
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
@@ -1490,7 +1491,6 @@ class ScrollableTest {
     }
 
     @Test
-    @IgnoreIosTarget // https://youtrack.jetbrains.com/issue/CMP-8401
     fun scrollable_nestedFling() = runComposeUiTest {
         var innerDrag = 0f
         var outerDrag = 0f
@@ -2413,7 +2413,6 @@ class ScrollableTest {
     }
 
     @Test
-    @IgnoreIosTarget // https://youtrack.jetbrains.com/issue/CMP-8401
     fun scrollable_flingBehaviourCalled() = runComposeUiTest {
         var total = 0f
         val controller =
@@ -2448,7 +2447,6 @@ class ScrollableTest {
     }
 
     @Test
-    @IgnoreIosTarget // https://youtrack.jetbrains.com/issue/CMP-8401
     fun scrollable_flingBehaviourCalled_reversed() = runComposeUiTest {
         var total = 0f
         val controller =
@@ -3154,13 +3152,12 @@ class ScrollableTest {
     }
 
     @Test
-    @IgnoreIosTarget // https://youtrack.jetbrains.com/issue/CMP-8401
     fun disableSystemAnimations_defaultFlingBehaviorShouldContinueToWork() = runComposeUiTest {
 
         val controller = ScrollableState { 0f }
         var defaultFlingBehavior: DefaultFlingBehavior? = null
         setScrollableContent {
-            defaultFlingBehavior = ScrollableDefaults.flingBehavior() as? DefaultFlingBehavior
+            defaultFlingBehavior = rememberDefaultFlingBehavior()
             Modifier.scrollable(
                 state = controller,
                 orientation = Orientation.Horizontal,
@@ -3410,7 +3407,7 @@ class ScrollableTest {
     }
 
     @Test
-    @IgnoreIosTarget // https://youtrack.jetbrains.com/issue/CMP-8401
+    @IgnoreIosTarget // Fling behavior on iOS does not use screen density
     fun onDensityChange_shouldUpdateFlingBehavior() = runComposeUiTest {
         var density by mutableStateOf(density)
         var flingDelta = 0f
@@ -3543,6 +3540,14 @@ class ScrollableTest {
             runOnIdle { assertThat(focusRequester.requestFocus()).isTrue() }
         }
     }
+
+    @Composable
+    private fun rememberDefaultFlingBehavior(): DefaultFlingBehavior {
+        val flingSpec = rememberSplineBasedDecay<Float>()
+        return remember(flingSpec) {
+            DefaultFlingBehavior(flingSpec)
+        }
+    }
 }
 
 // Very low tolerance on the difference