[bc25] Add an overscroll animation for Dual Shade.

Test: Manually tested by opening and closing the notifications shade on
a foldable device both in a folded and unfolded configuration.
Test: Unit tests build and pass.
Bug: 342463447
Bug: 337849926
Flag: com.android.systemui.dual_shade

Change-Id: Ica5412464d3f6976518ddb4e307a5d838326dfd8