[Debuggability] Log the menu actions PiP receives

Add extra log that prints out the list of action title whenever we
receive PictureInPictureParams update from the app.

Flag: com.android.wm.shell.enable_pip2
Bug: 401557393
Test: N/A log-only
Change-Id: I9a17cd59e903e692a4d37c535357bc1d0ebe2fa8