Add logging to DTC#shouldFullscreenTaskLaunchSwitchToDesktop

We've had several cases where a task should be launched in fullscreen
but launches in freeform - add some logs to see why that is.

Bug: 407714248
Flag: EXEMPT - logging only change
Test: manual
Change-Id: I6415761fba16c2d4f5439b1ce28e7c2d4678797f