50707 [flutter_tools] move engine unpack to the flutter tool (cla: yes, tool, waiting for tree to go green)

50710 [flutter_tools] remove globals from depfile usage (cla: yes, tool)

50715 Remove miscellaneous xcworkspacedata (cla: yes, d: examples, team, team: gallery, tool, waiting for tree to go green)

50731 Retry cURL downloads (cla: yes, team: infra, waiting for tree to go green)

50733 Generate message lookup in gen_l10n (a: internationalization, cla: yes, severe: API break, team)

50736 Revert “Roll engine 0e8ed2715a35..e0ebaea59071 (31 commits) (#50671)” (cla: yes, engine)