backport-2.1: sql: fix flaky TestLeaseRenewedPeriodically #28965
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Backport 1/1 commits from #28954.
/cc @cockroachdb/release
I changed GossipUpdateEvent as well which is strictly not needed
but there is a chance without it there will continue to be
some flakiness.
This fix essentially moves the check for release counts
further up before lease acquisition. This fixes a race
where after lease acquisition the periodic timer would
fire, acquire/release some leases.
fixes #28771
Release note: None