Bulk delete sierra patrons

[agnesgaroux]

What does this change?

wellcomecollection/platform#6400
About 18K patrons were recently deleted from Sierra and our usual set up (patron deletion tracker lambda) can not handle it

Manually created wellcomecollection-temp-auth0-user-deletions bucket in identity account
This PR

• modifies the patron deletion tracker lambda to write the list of deleted Sierra patrons to the above bucket
• give the lambda permission to write to the bucket
• add a script that reads the deleted user list from S3 and slowly deletes them from auth0

How to test

Try it in stage first

How can we measure success?

All patrons deleted from Sierra are all gone from Auth0

Have we considered potential risks?

The code is very similar to what has been running in the patron deletion tracker lambda

[kenoir]

Good plan.