54233 [flutter_tools] ensure build fails if asset files are missing (cla: yes, tool)

54294 [flutter_tools] remove extra same repo check (cla: yes, tool)

54299 [flutter_tools] migrate devfs web to package_config (a: null-safety, cla: yes, tool)

54301 [flutter_tools] Remove packageMap usage and update package_config (a: null-safety, cla: yes, tool)

54313 [flutter_tools] fix routing test (cla: yes, tool)

54314 [gen_l10n] Expand integration tests (a: internationalization, cla: yes, tool, waiting for tree to go green)

54320 [flutter_tools] make verbose macOS builds actually verbose (cla: yes, tool)