Restructure logging for selection of share targets

After discussions with Matt restructuring the logging so each category
corresponds to one of the fields in the new sharesheet and add a field
that indicates the number of caller supplied share targets.
Also fixing a bug that resulted in double logging.

Bug: 131170860
Test: Manual testing with adb logcat
Change-Id: I75e69f7dec2d6634fca7d55321298d9d8acf4382