Corrects the recents and home stacks position around docked state (1/2)

Since splitting home stack into home and recents, some problems where
the home stack would appear above when home stack is not visible. This
would cause home stack to be below docked stack and think home is
visible when it is not. Then docking an app would minimize the docked
stack and go into a wierd state when recents is resumed/launched.

When docked stack is used, it will verify that recents is created and
avoids seeing home stack as visible when below docked stack with at
least 1 stack in between. Whenever an app is docked, this will make sure
home stack is below recents.

This will fix some parts of the cts tests that use
"adb shell am stack move-task <taskId> 3 true" and avoid glitches with
the docked stack.

The following scenarios were tested:
- Boot and dock and app without starting recents
- Dock after launching an app (when recents already created)
- Toggle dock with "adb shell am stack move-task <taskId> 3 true" and
undocking multiple times
- Dock with long press recents

Test: cts/hostsidetests/services/activityandwindowmanager/util/run-test
CtsServicesHostTestCases
android.server.cts.ActivityManagerDockedStackTests
Bug: 35351074, 35145587
Change-Id: I6ac25c64f7d1050ea2260631ff4c052fcca3f185