Allow CTS test to control organized tasks

Changes to allow CTS test to control organized task so we can have the
tests run the same way sys-ui is driving things now. Control is given
back to sys-ui once the test is done running.

Bug: 149338177
Test: atest CtsWindowManagerDeviceTestCases:SplitScreenTests
Change-Id: I74a03ee3411f5b10ea4e26c1cc3c663dc394dd97