50149 Fix Gold flake from gsutil fallback (a: tests, cla: yes, framework, team, team: flakes, team: infra, waiting for tree to go green)

50151 Revert “[flutter_tools] Migrate xcode_backend.sh to flutter assemble” (cla: yes, tool)

50152 Move the localization_utils camelCase function to LocaleInfo (cla: yes, f: cupertino, f: material design, team, waiting for tree to go green)

50153 Remove usages of StackTraceMapper (cla: yes, tool)

50154 Fix Path Separator in Service Workers (cla: yes, tool, waiting for tree to go green)

50157 Make Annotation’s localPosition relative to object (a: desktop, a: mouse, cla: yes, framework, waiting for tree to go green)