75773 Update Flutter SDK constraint in plugin test to match template (cla: yes, team)

75793 FlutterEngineGroup memory test: added precache before executing gradle. (cla: yes, team, waiting for tree to go green)

75797 [flutter_releases] Update additional pub packages to stable for 1.26.0-17.4.pre (cla: yes, team, tool)

75798 Add mac/android smoke catalina test to dashboard (cla: yes, team, waiting for tree to go green)

75813 Audit and update deprecation warnings (a: accessibility, cla: yes, f: material design, framework, team, waiting for tree to go green)

75814 change stack size test to test arm device (cla: yes, team, waiting for tree to go green)