63829 Make deprecation notice link to website downloads (cla: yes, tool, waiting for tree to go green)

63831 [flutter_tools] remove globals from utils (cla: yes, tool, waiting for tree to go green)

63833 SizeTransition sample code (a: animation, cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

63835 add vsync overhead to FrameTimingSummarizer (a: tests, cla: yes, framework, waiting for tree to go green)

63839 Limit about to <200 chars in the infra issue template (cla: yes, waiting for tree to go green)

63840 [flutter_tools] shrink fingerprinter API to currently used subset (cla: yes, tool, waiting for tree to go green)