79173 [flutter_tools] guard L service extension in debug mode (cla: yes, tool, waiting for tree to go green)

79263 [gen-l10n] Add nullable-getter flag (a: internationalization, cla: yes, tool, waiting for tree to go green)

79338 Allow writing startup_info.json to somewhere other than the build dir (cla: yes, tool, waiting for tree to go green)

79342 Migrate code_signing to null safety (a: null-safety, cla: yes, team, tool)

79343 Check for outdated Podfile before running pod install (cla: yes, tool)

79346 Migrate event_printer and test_config to null safety (a: null-safety, cla: yes, team, tool, waiting for tree to go green)