Support google sheets where data is not in first spreadsheet tab

Steps to reproduce:
1. start dev server
2. run [google sheet script](https://github.com/AIObjectives/tttc-light-js/blob/main/examples/googlesheet-with-config.mjs), using a URL parameter to specify a google sheet tab that is not the first tab in the spreadsheet

Expected behavior: the pipeline runs on data pulled from the google sheet tab specified

Observed behavior: the pipeline runs on data pulled from the first tab in the google sheet, regardless of which was specified

[Logic to pull data from google sheets here](https://github.com/AIObjectives/tttc-light-js/blob/main/dist/sheet.js)