[BACKEND] add new users to a google sheet showing their data

[bcho892]

Is your feature request related to a problem? Please describe.

Right now even though we have an export feature in #469, it may be easier to automatically have this information on a google sheet. To achieve this you may want to have a look at:

• Cloud functions <-- Steep learning curve OR
• Zapier <-- Plug and play

BEFORE MERGING

• [ ] Integration test written for services
• [ ] Schemas annotated if adding new models
• [ ] Code generation run (hint: yarn workspace server tsoa spec-and-routes)
• [ ] Appropriate mocks created where possible
• [ ] PR Reviewed (For non-trivial changes)
• [ ] Changes tested after rebasing on master or merging in master (hint: git fetch origin master:master, then git rebase master or git merge master)
• [ ] All required PR checks passing