75769 fix(flutter_driver): Properly declare socket as nullable (a: tests, cla: yes, framework, waiting for tree to go green)

75772 Update Flutter SDK constraint in integration test to match templates (cla: yes, team)

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)

75794 Fix for #75792 - allow use of Animator<Color?> with LinearProgressIndicator (cla: yes, f: material design, framework, waiting for tree to go green)

75796 Remove “unnecessary” imports in test/widgets (cla: yes, framework, waiting for tree to go green)