Add TaplTestsQuickstep#testExcludeFromRecents

- Add ExcludeFromRecentsTestActivity, and add it to the manifest
  with excludeFromRecents="true"
- Add the test to check the current Overview task content
  description, ensuring that the excludeFromRecents task is
  present directly after a gesture but not after going home.
Bug: 324495241
Flag: None
Test: TaplTestsQuickstep#testExcludeFromRecents

Change-Id: I06be53673f0ac06924f79b44f19744da066cc7ea
diff --git a/quickstep/Android.bp b/quickstep/Android.bp
index a290e84..f14cebd 100644
--- a/quickstep/Android.bp
+++ b/quickstep/Android.bp
@@ -52,5 +52,6 @@
         "tests/src/com/android/quickstep/TaplOverviewIconTest.java",
         "tests/src/com/android/quickstep/TaplTestsQuickstep.java",
         "tests/src/com/android/quickstep/TaplTestsSplitscreen.java",
+        "tests/src/com/android/launcher3/testcomponent/ExcludeFromRecentsTestActivity.java"
     ],
 }