* [infra] Upload latest.version metadata file for most recent build.
* move common functionality into build_lib
* pass content_type to get_signed_url
* format
* [infra] Skeleton of the changes needed for collecting DFT on the builder (#1632).
* move ENGINE_INFO to the helper as well
* make collect_dft +x
* syntax fixes
* add actual dataflow tracer script
* format
* more refactoring and cleanup
* format
* address Oliver's feedback
* format
* more fixes
* format
* do not redirect stderr to stdout
* add exit at the end of main
* address feedback from Oliver
Abhishek Arya