[FEATURE] Add dry-run or test Argument to update_locations.py

Is your feature request related to a problem? Please describe.
Add a dry-run or test argument to update_locations.py, just like what's done here: update_fileuri.py line 28. This will better enable testing of the script to run without actually changing data in test (or more importantly prod).

Describe the solution you'd like
Either mimicking the above with a dedication function to handle and parse script arguments or a user input function.

Describe alternatives you've considered
I think argparse would be the first choice. Another option could be input, but would need a lot more guardrails around user input and verifying that it works.

Additional context
Next time we need to update locations for an SI unit, consider including this as part of the development workflow.