fix!: drop chain proposals with empty validator set at spawn time (backport #1888)

[mergify]

Description

Closes: #1886

Problem
We do not drop consumer chains that are voted on and that end up having an empty validator set in their consumer genesis (e.g., an Opt In chain where no validator opts in during the voting period).

Solution
Drop proposals at spawn time if the validator set in the consumer genesis is empty.
A nicer solution would have been to have MakeConsumerGenesis return an error if the initial validator set is empty. However, this would have needed quite some refactoring and we would like to cut a release by tomorrow.

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• confirmed the correct type prefix in the PR title
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• confirmed all author checklist items have been addressed
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Summary by CodeRabbit

• New Features

  • Added validation to ensure the consumer genesis initial validator set is not empty before processing proposals.

• Tests

  • Enhanced unit tests to include expectations for GetLastValidators method in multiple test cases.

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This is an automatic backport of pull request #1888 done by [Mergify](https://mergify.com).

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