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

**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.