Fix far in the future issued_ats (core team only)

Summary

From a while ago, there are a number of issued_ats that are in the far future. Need a migration to fix them

why?

They cause incorrect reports, info for partners

Details

We went over the distribution ones in our sunday meeting -- the correct dates for the future dates for distributions are all obvious. We just need to do a migration to make the adjustment.
Check also donations and purchases.

Criteria for completion

• migration that fixes the itemizables with dates more than 1 year in the future. This is on a piecemeal basis.

Question for devs

Do we need to communicate about these? It's certainly possible that someone has reentered them after not being able to find them.

Further note

We should communicate with the affected users when we fix this. With a mind to inventory levels, etc. So this might be different for different users (depending on the date)

Start by locating the itemizable records and issued_at fields for distributions, donations, and purchases, then inspect the affected future-dated data. Confirm how the correct dates are determined before designing the migration. Done means records more than one year in the future are corrected piecemeal and the affected-user communication requirement is resolved.