79674 Revert “Support block delete with word and line modifiers (#77172)” (cla: yes, framework)

79676 [flutter_tools] allow winuwp build to setup generated cmake file (cla: yes, tool, waiting for tree to go green)

79682 Migrate doctor_validator to null safety (a: null-safety, cla: yes, team, tool, waiting for tree to go green)

79695 Support block delete with word and line modifiers (cla: yes, framework)

79743 Update the Dismissible code sample (cla: yes, d: examples, framework, waiting for tree to go green)

79771 Fix typo in scroll_activity.dart (cla: yes, framework, waiting for tree to go green)