Add a script to generate the golden clients from the golden files

[Hectorhammett]

Is your feature request related to a problem? Please describe.
Currently in order to create a new Golden client for unit testing it is required to copy files from your temporary folder into the golden folder manually. There should be a way to update all of them in a single command.

Describe the solution you'd like
We currently have a run_tests.sh. We could create a update_golden_clients.sh or similar.

Describe alternatives you've considered
Utilizing a parameter to the test script.