Allow voting with locks whose voted-for-proposal did not receive any funds

[p-offtermatt]

Description

Closes: N/A

Add a description of the changes that this PR introduces and the files that
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This makes it so that if a lock has voted for a long-deployment-duration proposal in a past round,
but that proposal did not end up getting any funds deployed, then the lock can vote again.

This adds:

• logic in process_votes to let locks vote
• logic in enrich_lockups_with_tranche_infos to properly reflect this in the query endpoints
• a unit test to verify the new behaviour

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Author Checklist

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I have...

• Targeted the correct branch
• Included the necessary unit tests
• Added/adjusted the necessary interchain tests
• Added a changelog entry in .changelog
• Compiled the contracts by using make compile and included content of the artifacts directory into the PR
• Regenerated front-end schema by using make schema and included generated files into the PR
• Updated the relevant documentation or specification
• Reviewed "Files changed" and left comments if necessary
• Confirmed all CI checks have passed