39988 Roll build runner and remove delay (cla: yes, team, tool, ☸ platform-web)

39997 Remove visibleForTesting annotation; this constructor is used outside… (cla: yes, passed first triage, tool, waiting for tree to go green)

39999 Disable the performance overlay for web (cla: yes, framework, ☸ platform-web)

40001 Update to latest dwds (cla: yes, team)

40005 Cherry-picks for 1.9.1 (cla: yes, engine)

40007 CupertinoAlertDialog dark mode & CupertinoActionSheet fidelity (cla: yes, f: cupertino, framework)

40009 Add null check to _IndicatorPainter._tabOffsetsEqual() to prevent crash (cla: yes, f: material design, framework, severe: crash)