31798 Fix tab indentation (cla: yes, framework, tool, waiting for tree to go green)

31822 remove unnecessary artificial delay in catalog example (cla: yes, d: examples, framework)

31824 fix FlutterDriver timeout (cla: yes, framework, t: flutter driver)

31825 Fix missing return statements on function literals (cla: yes, team, tool)

31850 Make Gradle error message more specific (cla: yes, tool)

31851 Add documentation to Navigator (cla: yes, framework)

31852 Text selection handles are sometimes not interactive (cla: yes, f: cupertino, f: material design, framework)

31861 Add Horizontal Padding to Constrained Chip Label Calculations (cla: yes, f: material design, framework)