85451 Revert “Audit hashCode overrides outside of packages/flutter” (a: tests, team, tool, framework, f: material design, a: accessibility, cla: yes)

85472 Remved ButtonBar references from material tests (framework, f: material design, cla: yes, waiting for tree to go green)

85484 Eliminate some regressions introduced by the new lookup code (a: tests, framework, f: material design, a: accessibility, cla: yes, f: cupertino, d: api docs, waiting for tree to go green, documentation)

85497 Fix three additional cases where doc references are not conforming to new lookup code restrictions (a: tests, framework, f: material design, cla: yes, waiting for tree to go green)

85501 Migrate dev/benchmarks/macrobenchmarks to null safety. (team, f: material design, cla: yes, a: null-safety)