54973 [flutter_tools] Reland: fix multiple dart defines (cla: yes, team, tool)

54978 Expose current day as a parameter to showDatePicker. (cla: yes, f: material design, framework, waiting for tree to go green)

54981 disable hit testing if the CompositedTransformFollower is hidden when… (cla: yes, framework)

54985 Step 2: SnackBarBehavior.floating offset fix by default (cla: yes, f: material design, framework, waiting for tree to go green)

54987 git pull –ff-only (cla: yes, tool, waiting for tree to go green)

54989 Support armv7s architecture (cla: yes, platform-ios, tool)

54991 Mark ios_app_with_watch_companion as not flaky (a: tests, cla: yes, team)