70403 Clean up Windows plugin template (cla: yes, tool)

70405 Add -miphoneos-version-min=8.0 to App framework stub (cla: yes, platform-ios, tool)

70412 [flutter_tools] Add bot configuration to run web_tool_tests for linux, mac, and windows (cla: yes, team, tool)

70415 [gen-l10n] NNBD generated code (cla: yes, tool)

70475 [flutter_tools] remove automatic doctor from flutter create (cla: yes, tool)

70480 [flutter_tools] remove unused JSON schema (cla: yes, tool)

70482 [flutter_tools] remove global variables from mdns client (cla: yes, tool, waiting for tree to go green)