52782 [flutter_tools] disable added integration test due to Cirrus flakes (cla: yes, team, tool)

52789 Fix web test flakiness; enable web golden tests (a: tests, cla: yes, f: material design, framework, team, tool, waiting for tree to go green, will affect goldens)

52806 Roll engine 083a7c2bcaaf..3a2cc9553346 (7 commits) (cla: yes, waiting for tree to go green)

52807 [Api Docs] Improves contentPadding documentation in InputDecoration (cla: yes, d: api docs, documentation, f: material design, framework, waiting for tree to go green)

52821 [flutter_tools] remove unused Snapshot.dart artifact and associated code (cla: yes, tool)