78942 Migrate visual_studio to null safety (a: null-safety, cla: yes, team, tool)

78943 Migrate platform_plugins to null safety (a: null-safety, cla: yes, team, tool)

78944 Migrate flutter_project_metadata to null safety (a: null-safety, cla: yes, team, tool)

78949 Migrate device_port_forwarder to null safety (a: null-safety, cla: yes, team, tool)

78954 [flutter_tools] throwToolExit should return Never (cla: yes, tool, waiting for tree to go green)

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