37880 reduce mac workload (cla: yes)

37881 Remove no-longer-needed scripts (cla: yes, team, waiting for tree to go green)

37882 Add dense property to AboutListTile (cla: yes, f: material design, framework)

37891 Focus debug (a: desktop, cla: yes, framework)

37895 Revert “Add equals and hashCode to Tween” (cla: yes, framework)

37900 Listen to ExtensionEvent instead of TimelineEvent (cla: yes, framework, tool)

37904 test tool scheduling (cla: yes, team)

37906 Always install the ephemeral engine copy instead of fetching from CocoaPods specs (a: existing-apps, cla: yes, team, tool, ⌺‬ platform-ios)