63313 Small documentation typo fix (d: api docs, documentation, framework, waiting for tree to go green)

63336 Remove unused l and --isolate-filter tools (team, tool, waiting for tree to go green)

63339 Remove enableR8=true from gradle.properties (tool, waiting for tree to go green)

63347 Some minor improvements to the AsyncSnapshot API (framework, waiting for tree to go green)

63352 Clip image of BoxDecoration to circle when shape is BoxShape.circle (a: quality, framework, waiting for tree to go green)

63368 [gen_l10n] Absolute project path parameter (a: internationalization, team, tool, waiting for tree to go green)

63390 update for WidgetTester.move and WidgetTester.fling doc (a: tests, framework, waiting for tree to go green)