release-20.1: server: fix bug where SQL stats were not flushed into reportable stats #52072
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Backport 1/1 commits from #49392.
/cc @cockroachdb/release
Fixes #49388.
This was caused by the background loops use an incorrect setup to reset
collected stats.
Also, fix a bug where statements issued at the same time that the SQL
stats are flushed would not be reported.
Release note: None