Move policy handling into ATM hierarchy [4/n]

Moves Task-level policy into configuration update

This moves most of the configuration policy logic out of
updateOverrideConfig and into the configuration update via
the new resolveOverrideConfiguration stage. The advantage
of this is that the TaskRecord configuration is more
adaptive: for example, minimal task bounds enforcement
is now done during resolve, so the task's override bounds
can be retained even when the task is drawn bigger. This
also fixed some issues with minimal task bounds (ie. it
no-longer relies on exact size-match).

As part of this, a bunch of logic was pulled out of the
StackWindowController and moved/rewritten in TaskRecord.
This was done so that the policy logic would be more
adaptive to changes in their parents and to help with
our ATM/WM merge goal.

This also presented an opportunity to move more resize
logic into the separate displayed bounds paradigm.

Bug: 113900640
Test: go/wm-smoke + wmtests
Change-Id: Ie27020616983646b274b073f17accea627399df0