62520 Fix even more unresolved doc references in material (cla: yes, d: api docs, documentation, f: material design, framework, team, waiting for tree to go green)

62523 Make the text field macrobenchmark work in debug mode (cla: yes, team, waiting for tree to go green)

62525 update to use more null safe packages (cla: yes, team, tool, waiting for tree to go green)

62529 Expose certain functions used when rolling Flutter (cla: yes, team)

62534 [flutter_tools] deflake integration tests by running single isolate (cla: yes, team, waiting for tree to go green)

62539 migrate macrobenchmark/multi_widget_construction test to e2e (cla: yes, team, waiting for tree to go green)