58037 [SwitchListTile] adds controlAffinity property (cla: yes, f: material design, framework, waiting for tree to go green)

58050 Flutter 1.17.2 cherrypicks (a: accessibility, cla: yes, d: examples, engine, f: cupertino, f: material design, framework, team, tool, work in progress; do not review)

58094 Set upper limit on text scaling for AppBar.title (cla: yes, f: material design, framework, waiting for tree to go green)

58117 Minor correction to documentation for buttonColor (cla: yes, d: api docs, f: material design, framework, waiting for tree to go green)

58154 Allow null value for CheckboxListTile (cla: yes, f: material design, framework, waiting for tree to go green)