[v14] auth: require a semaphore in order to complete uploads #41104
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Having multiple auth servers attempt to complete uploads against the same shared backend results in racy behavior. This code is focused on cleanup and is not performance sensitive, so we leverage a semaphore to make sure only one auth server is attempting to complete uploads at any point in time. This new behavior can be disabled with an environment variable, which will provide an escape hatch in case we we encounter problems with it.
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Backport #40926 to branch/v14
changelog: Improve the reliability of the upload completer.