Google Drive Sheets webhooks might not always be triggered or processed.

[mbertrand]

Steps to Reproduce

Not all sheets seem to get processed by the xpro webhook endpoint when changes are made. We should try to determine if the webhook endpoint was hit but errored, or never called at all, for these sheet ids.

[mbertrand]

The webhook endpoint was hit for all google sheet ids in the above tickets at least once, with a 200 response code.

Some (but not all) of these sheets have error events under:
Current file watch in the database for Coupon Assignment sheet is expired. Some file changes may have failed to trigger a push notification
or
sheets.tasks.schedule_coupon_assignment_sheet_handling - 'dict' object has no attribute 'replace' - should be fixed by #2565

[mbertrand]

On RC, when new GoogleFileWatch objects are created, the expiration date is the same as the activation date. I had to manually run manage.py setup_file_watch --sheet-id <sheed_id> --sheet-type enrollassign --confirm to get it to process. Will look further into this later.