66020 Remove deprecated activity indicator (cla: yes, f: cupertino, framework, waiting for tree to go green)

66023 Fix mistake in the docs of RouteInformationParser (cla: yes, framework, waiting for tree to go green)

66024 migrate some cupertino files to nullsafety (cla: yes, f: cupertino, framework)

66027 Revert “TextField constrained layout bug” (cla: yes, f: material design, framework)

66031 Revert “always adds alert label for alert dialog in Android” (cla: yes, f: material design, framework)

66039 fix mouse wheel scroll miscontrol of ScrollPosition. (a: desktop, a: mouse, cla: yes, f: scrolling, framework, waiting for tree to go green)