Fix broken TaplTestsTaskbar splitscreen test cases

The split tasks no longer close between test orientation changes. Updating tests to close all tasks after TaplTestsTaskbar test cases

Flag: not needed
Fixes: 279063348
Test: TaplTestsTaskbar
Change-Id: Ie654aae0a16ff495555b48f85a8dec8537086649
diff --git a/quickstep/tests/src/com/android/quickstep/TaplTestsTaskbar.java b/quickstep/tests/src/com/android/quickstep/TaplTestsTaskbar.java
index 6243471..4540eee 100644
--- a/quickstep/tests/src/com/android/quickstep/TaplTestsTaskbar.java
+++ b/quickstep/tests/src/com/android/quickstep/TaplTestsTaskbar.java
@@ -27,6 +27,7 @@
 import androidx.test.filters.LargeTest;
 import androidx.test.runner.AndroidJUnit4;
 
+import com.android.launcher3.tapl.Overview;
 import com.android.launcher3.tapl.Taskbar;
 import com.android.launcher3.ui.TaplTestsLauncher3;
 import com.android.launcher3.util.LauncherLayoutBuilder;
@@ -63,6 +64,10 @@
                 "com.android.launcher3.testcomponent.BaseTestingActivity");
         mLauncherLayout = TestUtil.setLauncherDefaultLayout(mTargetContext, layoutBuilder);
         TaplTestsLauncher3.initialize(this);
+        Overview overview = mLauncher.getWorkspace().switchToOverview();
+        if (overview.hasTasks()) {
+            overview.dismissAllTasks();
+        }
 
         startAppFast(CALCULATOR_APP_PACKAGE);
         mLauncher.enableBlockTimeout(true);