PR #110246 - persistedsqlstats: add cluster setting to enable flush on row limit r…

[cockroach-teamcity]

Related PR: cockroachdb/cockroach#110246
Commit: cockroachdb/cockroach@5f8ae05
Fixes: CRDB-30630

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Release note (sql change):
This commit introduces the cluster setting sql.stats.limit_table_size.enabled
which controls whether or not we enforce the row limit set by sql.stats.persited_rows.max
in the system.{statement,transaction} statistics tables.