Update `updateapilist.py` script to avoid making API requests for fetching the list of clients.

[ohmayr]

instead of making API calls to fetch the list of split repos and the packages in the mono repo, we can:

1. Hardcode the list of split repos within the script.
2. Do a local search of the list of mono-repo packages.

As a result we can clean up the use of GITHUB_TOKEN in the workflow to update the API list in the README.