Revert "[performance] Process dirty nodes from top to bottom during paint to avoid unnecessary layer tree walks" (#98520)

[performance] Process dirty nodes from top to bottom during paint to avoid unnecessary layer tree walks (#98219)

This reverts commit 988959da.

This reverts commit 5fd259be.

This reverts commit d056500b.

This reverts commit 31de052e.

This reverts commit e2490f29.

This reverts commit c75edc26.

The assert was never hitting because it was first hitting a
null cast error in the `renderer.parent!` line in the for
loop.