Renamed moveTaskToDockedStack to setTaskWindowingModeSplitScreenPrimary

Renamed a few functions related to moveTaskToDockedStack to use the new
notion of split screen primary windows instead of docked stack. Most of
the calls that use moveTaskToDockedStack are renamed.

Test: go/wm_smoke
Bug: 68017311
Change-Id: I73df051a9261d213b3415ac132962d91ec632e0a
19 files changed