54467 [flutter_tools] update compilation to use package config (a: null-safety, cla: yes, tool)

54471 fix visual density prefer_const_constructors lint (cla: yes, team)

54474 Roll engine 9101b63f9872..49f7cd04ac57 (14 commits) (cla: yes, waiting for tree to go green)

54478 Fix environment leakage in doctor_test (cla: yes, team, team: flakes, team: infra, tool)

54479 Enable gesture recognizer in selectable rich text (cla: yes, framework, waiting for tree to go green)

54480 Revert “[flutter_driver] Add SceneDisplayLag stats to timeline summar… (a: tests, cla: yes, framework, team)