[BUG] Google Sheets - can we emit new rows after deleted ones?

**Describe the bug**
Our trigger uses the last processed row number to know when to emit new rows. This causes issues if a row is deleted and then another one is created, since it will be exactly the same row number as the last one processed (and can be lower).

I'll make some tests to see if we can address this issue.

**Additional context**
User also said that if the sheet is updated via a workflow or external service (e.g. Google Forms), then Google Sheets doesn't send the webhook immediately and requires the spreadsheet to be open in a computer.