69114 [flutter_tools] enable web integration tests (cla: yes, tool)

69115 [flutter_tools] handle windows holding file lock in web build directory (cla: yes, tool)

69117 Add Directionality.maybeOf (cla: yes, framework, waiting for tree to go green)

69119 Adaptive icons (cla: yes, f: material design, framework, team)

69121 [flutter_tools] fix test expectation in resident_runner.dart (cla: yes, tool)

69122 [null-safety] fix the snippets (cla: yes, team, waiting for tree to go green)

69126 reland driver vm_service migration (a: tests, cla: yes, framework, team, tool)