Add logging for reshuffle of direct share targets

Direct share targets can update after they have been initially
displayed. This modifies the logging that was there to indicate when the
direct targets are displayed for the first time and when they are being
reordered.

Bug: 126920281
Test: successfully ran atest ChooserActivityTest
Change-Id: I1d16c0fb2b5631473879ba9758128e6f482567c2