feat: post translation validation errors as a GitHub comment | FC-0012

[OmarIthawi]

This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

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[OmarIthawi]

Closing in favor of #1894

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@OmarIthawi Even though your pull request wasn’t merged, please take a moment to answer a two question survey so we can improve your experience in the future.