69761 Link the API docs on waitFor() to the docs for runUnsynchronized() (a: tests, cla: yes, framework)

69904 Ignore several import_of_legacy_library_into_null_safe (a: tests, cla: yes, framework)

70252 Fix Platform channel errors in web tests (a: tests, cla: yes, framework, waiting for tree to go green)

70319 Revert usages of the binding’s platformDispatcher to use window instead (a: accessibility, a: tests, cla: yes, framework)

70327 [flutter_releases] Flutter 1.22.4 framework cherrypicks (a: tests, cla: yes, d: examples, engine, f: cupertino, f: material design, framework, team, tool)