Revert discarded database pool check in load balancer
What does this MR do and why?
Some users have reported intermittent No connection pool for 'ActiveRecord::Base' found errors after updating to GitLab 18.4. This
is likely due to
!203779 (merged) because the
QueryAnalyzer is likely accessing the database before the database load
balancer has properly initialized everything.
Since the related issue was solved with
!203888 (merged), let's
revert the discarded? check for now.
References
Relates to #573581 (closed)
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Edited by Stan Hu