Remove StackWindowController and StackWindowListener (46/n)

TaskStack and ActivityStack hold each other as a member. ActivityStack
will create TaskStack while constructing.

Moved all pinned specific stack into general one.
PinnedStackWindowController, PinnedActivityStack are removed.

Test: go/wm-smoke
Test: atest WmTests
Bug: 80414790
Change-Id: I63e3ec429576ec62960d0280b048883a8ed5145c