fix oldumps

[mekarpeles]

@cclauss for you to review + update pls

These changes may not clean up files correctly after running -- we may want to add this part to the cron rather than this file (so when the cron is kicked off, it cleans up if the step is necessary). We don't want to remove the files the top of this script because it will negate the work of saving our place and gracefully restarting if we hit + fix an error

One error we had was around admin collections permission for the /olsystem ia.ini role user s3 account (which has since been fixed). It needed permission for ol_export

Q: Can we (e.g. using xauthn make a request to see what our permissions are as a e.g. regressions rest)
cc: @jimbonator

Technical

Testing

Stakeholders

@cclauss @cdrini

[mekarpeles]

Reviewed w/ @cclauss