86268 Revert “Migrate devicelab tasks a-f to null safety.” (team, f: material design, a: accessibility, cla: yes)

86374 Migrate devicelab tasks a-f to null safety. (team, f: material design, a: accessibility, cla: yes, waiting for tree to go green, a: null-safety)

86378 Migrate devicelab tasks f-i to null safety. (team, a: accessibility, cla: yes, a: null-safety)

86386 Revert “Clean up the bindings APIs” (a: tests, team, framework, f: material design, a: accessibility, cla: yes, f: cupertino, d: examples)