Remove votes_updated_at field from WitnessesVotersResponseSchema

Radosław Masłowskirequested to merge
rm-update-witnessesvotersresponseschema into develop

Remove votes_updated_at field from WitnessesVotersResponseSchema

Edit from @kmochocki Fix raising of missleading errors during executable startup, by catching them and raising FailedToStartExecutableError

Edited by Krzysztof Mochocki

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