Ensure Vale lefthook rule returns error codes when necessary
What does this MR do and why?
If there are errors in Vale, they should be reflected by Lefthook indicating failure. At the moment, successful prints to the terminal disguise that Vale threw an error code.
CC @claytoncornell @huzaifaiftikhar1 just FYI.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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