77294 Enable avoid_unnecessary_containers lint (a: accessibility, a: tests, cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)

77386 Roll Engine from 299eb3e710c1 to 67abe7f9a9e4 (13 revisions) (a: tests, cla: yes, engine, framework)

77398 enable prefer_function_declarations_over_variables lint (a: accessibility, a: tests, cla: yes, f: cupertino, f: material design, framework, team, tool, waiting for tree to go green)

77434 Enable unnecessary_await_in_return lint (a: tests, cla: yes, f: material design, framework, team, tool, waiting for tree to go green)