74532 Remove unused bigquery code and deps (cla: yes, team)

74535 Drop metrics_center (cla: yes, team, waiting for tree to go green)

74545 Allow tests to override _DevFSHttpWriter._startWrite throttle time (cla: yes, team, tool, waiting for tree to go green)

74622 [flutter_tools] Consistently set the working directory for Flutter Test (a: internationalization, cla: yes, f: cupertino, f: material design, team, tool, waiting for tree to go green)

74671 Roll packages (a: tests, cla: yes, framework, team, tool, waiting for tree to go green)

74675 Remove unused deploy_gallery.sh (cla: yes, team, waiting for tree to go green)