50304 Allow Android to be missing from multi-platform manifest (cla: yes, tool, waiting for tree to go green)

50305 Roll engine f34bc65bee49..f3ce90e9387b (20 commits) (cla: yes, waiting for tree to go green)

50306 Reduce duplication in sharded tests in .cirrus.yml (cla: yes, team: infra, waiting for tree to go green)

50307 Reland “Track lastKnownRemoteTextEditingValue separately from received data” (a: text input, cla: yes, framework)

50312 [flutter_tools] Prevent web ServiceWorker from modifying fetch requests. (cla: yes, tool, waiting for tree to go green)

50313 Update compile size benchmarks (cla: yes, team)