As an admin user, I want to be able to search people by tag in the admin site, so that I can more easily find people (as I can on the public site).

[blms]

Testing notes (QA)

On the QA site admin:

• Navigate to the people admin. You should now be able to search people by tags in the admin, using the same tag: syntax as in the public site.
• Navigate to a specific person's edit page, and scroll down to the person-person relations section. Try searching for the person whose page you are editing in the autocomplete in order to add a relationship to themself. You should not be able to do this (they shouldn't appear in the list).
  • This was a bug that was live in production, which I noticed in the course of this work—you can check it out on the prod site to compare

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Spun off from #1720; an admin version of the public tags search.