[Contracts] Resend contract

Allow contract signing parties to resend contract if they messed something up.

Or if that's a security issue, allow HCB Ops to resend contract (right now there's only a void option, so we need to go to docuseal and like re-copy over details and stuff).

This applies for both applications and manual contracts.

Start by tracing the contract-signing flow for applications and manual contracts, including the DocuSeal integration. Determine whether resend should be available to signing parties or only HCB Ops, then verify that resending avoids the current manual re-copying process for both contract types.

Written by the indexing model from the issue text.