51443 [flutter_tools] reduce globals in web validator and chrome launcher (cla: yes, tool)

51444 [flutter_tools] remove globals from plist parser and update tests (cla: yes, tool)

51453 Move embedding and linking Flutter frameworks into the tool (cla: yes, d: examples, platform-ios, t: xcode, team, team: gallery, tool)

51466 Revert “Retry cURL downloads” (cla: yes)

51468 fix pom file not found when run app with local engine (cla: yes, tool, waiting for customer response, waiting for tree to go green)

51476 Revert “[flutter_tools] initialize frontend server with build” (cla: yes, tool)

51477 [flutter_tools] Reland initialize frontend_sever with build (cla: yes, tool, waiting for tree to go green)