24994 Add polling module discovery for Fuchsia (cla: yes, tool, ○ platform-fuchsia)

24999 Remove TextField.noMaxLength, use maxLength = -1 instead (cla: yes, f: material design, framework)

25003 Fix typo in documentation (cla: yes, d: api docs, framework)

25007 Warn when building on master channel (cla: yes, tool)

25008 [Slider] Custom track, ticker, and overlay shape painters (cla: yes, f: material design, framework)

25013 Adds a small fix to the Cupertino Navigation demo (cla: yes, team: gallery)

25046 Add a check for build methods that return context.widget (cla: yes, framework)