91267 Migrate protocol_discovery to null safety (tool, cla: yes, waiting for tree to go green, a: null-safety)

91281 Don’t generate plugin registry in ResidentWebRunner (tool, cla: yes, waiting for tree to go green)

91300 Remove 10 second timewarp in integration test pubspec.yamls (tool, cla: yes)

91309 Migrate assets, common, icon_tree_shaker to null safety (tool, cla: yes, a: null-safety, tech-debt)

91317 Remove accidental print (tool, cla: yes, waiting for tree to go green)