Alan Guo Xiang Tan 19a92fbadc
PERF: Switch ActiveRecord PG connection active check to use empty query. (#13323)
See https://github.com/rails/rails/pull/42368

The impact is not quantifiable at the time of this writing but
prelimary investigation shows that `SELECT 1` accounts for 0.09 of CPU
time on a database. Note that Discourse runs thousands of databases so
the small impact may be amplified by the large number of databases that
we run.
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