74088 Revert “Improve the ScrollBar behavior when nested” (cla: yes, f: cupertino, f: material design, framework)

74089 Update the alt text to match recommendations in HTML spec (cla: yes, framework, waiting for tree to go green)

74093 ScaffoldMessenger only shows to root nested Scaffold (a: layout, a: quality, cla: yes, customer: money (g3), f: material design, framework, waiting for tree to go green, will affect goldens)

74104 Reland “Improve the ScrollBar behavior when nested (#71843)” (cla: yes, f: cupertino, f: material design, f: scrolling, framework, waiting for tree to go green)

74131 Add material icons golden test (cla: yes, f: material design, framework)