Add logs for debugging flaky test

See b/154080003#comment2 for the detail.

Add logs to show when ACTION_PACKAGE_FULLY_REMOVED is received.
We can tell if the broadcast is late from the timestamp.

Bug: 154080003
Test: atest RollbackTest
Change-Id: I84234ba7cebe793c3bb1d0aab2739b22f5c7d11c