Propose reason for rejecting a save code now

As a first step towards giving more feedback for users who submitted wrong origins for ingestion (e.g. organization links, tarballs with wrong visit type, link to html page probably for listing, etc...). We could allow the operator which rejects the origins a free form input field so they could explain the reason of the rejection.

It would give the opportunity to the submitter to try and fix theirs input if they wanted to.

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Migrated from T3256 (view on Phabricator)