88857 Fixed leak and removed no-shuffle tag in widgets/debug_test.dart (a: tests, team, framework, cla: yes, waiting for tree to go green, tech-debt)

88877 Fixed leak and removed no-shuffle tag in platform_view_test.dart (a: tests, team, framework, cla: yes, waiting for tree to go green, tech-debt)

88878 Fix index of TabBarView when decrementing (framework, f: material design, cla: yes)

88881 Fixed leak and removed no-shuffle tag in routes_test.dart (a: tests, team, framework, cla: yes, waiting for tree to go green, tech-debt)