56481 [flutter_tools] throw StateError instead of null (cla: yes, waiting for tree to go green)

56485 Roll engine c3cd83baf8bc..d6aa099de7c7 (3 commits) (cla: yes, waiting for tree to go green)

56490 [gen_l10n] Optionally generate list of inputs/outputs (a: internationalization, cla: yes, tool, waiting for tree to go green)

56491 [flutter_tools] fix windows vs code lookup with missing platform environment variables (cla: yes, waiting for tree to go green)

56492 Fix silent test failure in image cache tests (cla: yes, waiting for tree to go green)

56494 Wire up autofocus for OutlineButton (cla: yes, f: material design, framework)