79058 Revert “[Fonts] Update material icons (#78311)” (cla: yes, f: material design, framework)

79085 Redo fix for button.icon layout overflow (cla: yes, f: material design, framework)

79193 docs: add an example to ReorderableListView.builder (cla: yes, f: material design, framework)

79239 Remove references to @required in favor of the required keyword (cla: yes, f: material design, framework, waiting for tree to go green)

79297 Add scrollbar tests for simultaneous scroll/drag (a: tests, cla: yes, f: cupertino, f: material design, f: scrolling, framework, waiting for tree to go green)

79299 add missing trailing commas (a: accessibility, cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)