89699 Skip the drawShadow call in a MergeableMaterial with zero elevation (framework, f: material design, cla: yes, waiting for tree to go green)

89700 Update ScaffoldMessenger docs for MaterialBanners (framework, f: material design, cla: yes, d: api docs, waiting for tree to go green, documentation)

89782 master->main default branch migration (a: tests, tool, framework, cla: yes, waiting for tree to go green)

89795 Remove “unnecessary” imports from packages/ (a: tests, tool, framework, cla: yes, waiting for tree to go green)

89822 Revert “Revert “Fix computeMinIntrinsicHeight in _RenderDecoration (#87404)” (#89667)” (framework, f: material design, cla: yes)