49280 fix multiline FlutterError (cla: yes, f: material design, framework, waiting for tree to go green)

49301 [flutter_tools] rollback to dwds 0.8.5, fix versioning (cla: yes, team, tool, waiting for tree to go green)

49310 [web] Wire the “–start-paused” flag correctly for web (cla: yes, platform-web, tool)

49312 Roll engine 83a64b7233d5..46e58b930d11 (9 commits) (autoroller: commit, cla: yes)

49315 [flutter_tools] Reland fast start by default for Android (cla: yes, team, tool, waiting for tree to go green)

49319 recommendDeferredLoading (cla: yes, f: scrolling, framework, waiting for tree to go green)