63609 Clean up flutter_gallery__transition_perf (a: accessibility, cla: yes, team, waiting for tree to go green)

63617 [flutter_tools] update size analysis version (cla: yes, team, waiting for tree to go green)

63649 gen_l10n: support string list as preferred-supported-locales, as documented (cla: yes, team, tool)

63726 Add windows builders to presubmit. (cla: yes, team)

63736 Update task_names to add the platform. (cla: yes, team, waiting for tree to go green)

63783 Add enabled flag for try builders (cla: yes, team)

63797 add flutter_gallery__transition_perf_e2e to ios tests (cla: yes, team, waiting for tree to go green)