78329 Revert “Align more closely with package:test” (a: accessibility, a: tests, cla: yes, f: material design, framework, team, tool)

78343 Align more closely with package:test (#77118) (a: accessibility, a: tests, cla: yes, f: material design, framework, team, tool, waiting for tree to go green)

78353 [flutter_tools] remove globals from logger (cla: yes, tool)

78355 Revert “[devicelab] Migrate Gallery to BuildTestTask” (a: accessibility, cla: yes, team)

78357 [flutter_tools] remove globals from process, fs (cla: yes, tool)

78359 [flutter_tools] migrate context to null safety (cla: yes, tool)