Make cron to remove obsolete keys from estuary

`GET https://api.estuary.tech/user/api-keys`

then

```js
keys.filter(({ expiry }) => new Date(expiry) < Date.now).map(({ id }) => id)
```

`DELETE https://api.estuary.tech/user/api-keys/:id`

Start by locating the worker's scheduled-task or cron entry point and how it makes outbound requests. Use GET https://api.estuary.tech/user/api-keys, identify expired key IDs, and DELETE each corresponding /user/api-keys/:id endpoint. Done means expired keys are removed on the schedule without affecting unexpired keys.

Written by the indexing model from the issue text.