Improve test isolation in AbstractLauncherUiTests

- Removing suspicious duplicate uses of AbstractLauncherUiTest.initialize to prevent unnecesary launcher restarts
- Adding UiDevice#pressHome to AbstractLauncherUiTests.verifyLauncherState to ensure the next test starts with a known clean state

Flag: EXEMPT test fix
Fixes: 372956489
Test: AbstractLauncherUiTest
Change-Id: Id68ece4ab195a4f6c47aa401eb50a91b8ff70e10

quickstep/tests/src/com/android/quickstep/TaplPrivateSpaceTest.java

@@ -56,8 +56,6 @@ public class TaplPrivateSpaceTest extends AbstractQuickStepTest {
     @Override
     public void setUp() throws Exception {
         super.setUp();
-        initialize(this);
-
         createAndStartPrivateProfileUser();
 
         mDevice.pressHome();

tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java

@@ -415,6 +415,7 @@ public abstract class AbstractLauncherUiTest<LAUNCHER_TYPE extends Launcher> {
     public void verifyLauncherState() {
         try {
             // Limits UI tests affecting tests running after them.
+            mDevice.pressHome();
             mLauncher.waitForLauncherInitialized();
             if (mLauncherPid != 0) {
                 assertEquals("Launcher crashed, pid mismatch:",

tests/src/com/android/launcher3/ui/TaplWorkProfileTest.java

@@ -70,7 +70,6 @@ public class TaplWorkProfileTest extends AbstractLauncherUiTest<Launcher> {
     @Override
     public void setUp() throws Exception {
         super.setUp();
-        initialize(this);
         String output =
                 mDevice.executeShellCommand(
                         "pm create-user --profileOf 0 --managed TestProfile");

tests/src/com/android/launcher3/ui/workspace/TaplWorkspaceTest.java

@@ -32,7 +32,6 @@ import com.android.launcher3.util.TestUtil;
 import com.android.launcher3.util.rule.ScreenRecordRule.ScreenRecord;
 
 import org.junit.After;
-import org.junit.Before;
 import org.junit.Test;
 
 /**
@@ -50,12 +49,6 @@ public class TaplWorkspaceTest extends AbstractLauncherUiTest<Launcher> {
         return launcher.getWorkspace().getCurrentPage();
     }
 
-    @Before
-    public void setUp() throws Exception {
-        super.setUp();
-        initialize(this);
-    }
-
     @After
     public void tearDown() throws Exception {
         if (mLauncherLayout != null) {