"AD" field for ISE should show the then current ISE

[ekr]

Describe the issue

If you look at the datatracker page for ISE stream documents, you can see that it has an "AD/Shepherd" column. https://datatracker.ietf.org/stream/ise/

Or the AD/Shepherd field for individual RFCs: https://datatracker.ietf.org/doc/rfc8734/

This lists "Eliot Lear" even for documents published before he became ISE.

Even more confusing, it says that you should email rfc-ise@rfc-editor.org and that that's Adrian

ISTM that the POC should be the current ISE but the AD/Shepherd should be who it was at the time.

Note that this is largely correct for IETF RFCs

Code of Conduct

• [X] I agree to follow the IETF's Code of Conduct

[rjsparks]

Several related things:

• Discussion in #6597 suggests removing the AD/Shepherd column from the search result tables.
• The "Send Notices to" field is holding a string (not a reference to an Email object) that was set by pasting content at the time. We should script cleaning role-based addresses that have been pasted into them (probably by stripping them down to the address).
• The Document shepherd field IS pointing to an Email object, and this further highlights that
  1. having role-based addresses as datatracker Email objects vs aliases was not a great idea (it intersects badly with Email addresses being associated with one and only one Person).
  2. it would be better for the Shepherd field to point to a Person rather than an Email address.

Repairing history when changes are made for the last bullet will be a chore.