Merge #85994

85994: insights: remove the ingester for now r=matthewtodd a=matthewtodd

In #85350 we introduced a data race that's affecting many branches in
CI. Until we can get to the bottom of it, probably in #83080, let's just
remove the offending codepath.

Release note: None

Co-authored-by: Matthew Todd <[email protected]>

pkg/sql/sqlstats/insights/insights.go

@@ -140,5 +140,5 @@ type Registry interface {
 
 // New builds a new Registry.
 func New(st *cluster.Settings, metrics Metrics) Registry {
-	return newConcurrentBufferIngester(newRegistry(st, metrics))
+	return newRegistry(st, metrics)
 }