ExpandHelper and ExpandHelperTest now use AndroidX / AnimatorTestRule

WMShell.FlingAnimationUtils now supports the AndroidX Animator

Bug: 291636627
Test: atest ExpandHelperTest
Change-Id: I7637eeeb5f5a6b11b71683bd3bbe1fad1ca186c3
diff --git a/libs/WindowManager/Shell/Android.bp b/libs/WindowManager/Shell/Android.bp
index 7159893..603272e 100644
--- a/libs/WindowManager/Shell/Android.bp
+++ b/libs/WindowManager/Shell/Android.bp
@@ -151,6 +151,7 @@
     ],
     static_libs: [
         "androidx.appcompat_appcompat",
+        "androidx.core_core-animation",
         "androidx.arch.core_core-runtime",
         "androidx-constraintlayout_constraintlayout",
         "androidx.dynamicanimation_dynamicanimation",