27252 Add support for experimental flags during hot reload. (cla: yes, t: hot reload, tool)

27253 [flutter_tool,doctor] Fix and test gen_snapshot failure message (cla: yes, tool)

27256 Update additionalTime in TestWidgetsFlutterBinding.runAsync() to 1000. (a: tests, cla: yes, team)

27257 Add basic codegen app to be used for integration testing and benchmarks (a: tests, cla: yes, tool)

27260 Update Align docs (cla: yes, framework, waiting for tree to go green)

27261 format parameter list (cla: yes, team)

27271 Remove all obsolete “// ignore:” (cla: yes, team, waiting for tree to go green)