78961 Support WebSockets for dwds injected client (cla: yes, tool, waiting for tree to go green)

78975 [gen-l10n] Remove more ignores, conditionally generate some code (a: internationalization, cla: yes, tool, waiting for tree to go green)

78984 [SliverAppBar] Improve dartpad sample in documentation (cla: yes, d: api docs, d: examples, documentation, f: material design, framework, waiting for tree to go green)

78988 [flutter_tools] migrate tool_backend.dart to null safety and add testing of exit conditions (cla: yes, tool, waiting for tree to go green)

78990 InteractiveViewer should call onInteractionUpdate even when gesture is disabled (cla: yes, framework, waiting for tree to go green)

78991 Manually close the tree (cla: yes, team)