84478 Turn on avoid_dynamic_calls lint in packages/flutter tests, make appropriate changes. (a: tests, team, tool, framework, f: material design, a: accessibility, a: internationalization, cla: yes, f: cupertino, d: examples, waiting for tree to go green)

84809 Make scrollbar assertions less aggressive (a: tests, team, framework, f: scrolling, cla: yes, f: cupertino, d: api docs, d: examples, waiting for tree to go green, documentation, a: error message, tech-debt)

84812 Disable auto scrollbars on desktop for legacy flutter gallery (a: tests, team, framework, team: gallery, f: scrolling, cla: yes, waiting for tree to go green, integration_test, tech-debt)

85094 Remove tests checking Xcode 11 naming conventions (a: tests, team, platform-ios, cla: yes, waiting for tree to go green)