37595 Closes #37593 Add flutter_export_environment.sh to gitignore (cla: yes, tool, waiting for tree to go green)

37624 Diagrams for API docs rank 10-20 in most views (cla: yes, d: api docs, d: examples, f: material design, framework, from: study, waiting for tree to go green)

37631 [Material] Create demo for material banner (cla: yes, d: examples, f: material design, team, team: gallery)

37634 [web][upstream] Update diagnostics to support web platform tests (cla: yes, f: material design, framework)

37636 Add CheckboxListTile checkColor (cla: yes, f: material design, framework)

37637 don’t call Platform.operatingSystem in RenderView diagnostics (cla: yes, framework, ☸ platform-web)