Only log inefficient query error

What does this MR do and why?

Log inefficient query error, rather than logging and sending exception to Sentry

This error is, by many orders of magnitude, the most frequent error on Sentry (https://sentry.gitlab.net/gitlab/gitlabcom/?query=is%3Aunresolved&sort=freq)

We will still raise in dev, and test.

Related issue: #328500 (closed)

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