Fix StatisticsObjIsVisibleExt() for pg_temp.

Neighbor get_statistics_object_oid() ignores objects in pg_temp, as has
been the standard for non-relation, non-type namespace searches since
CVE-2007-2138.  Hence, most operations that name a statistics object
correctly decline to map an unqualified name to a statistics object in
pg_temp.  StatisticsObjIsVisibleExt() did not.  Consequently,
pg_statistics_obj_is_visible() wrongly returned true for such objects,
psql \dX wrongly listed them, and getObjectDescription()-based ereport()
and pg_describe_object() wrongly omitted namespace qualification.  Any
malfunction beyond that would depend on how a human or application acts
on those wrong indications.  Commit
d99d58cdc8 introduced this.  Back-patch to
v13 (all supported versions).

Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/20250920162116.2e.nmisch@google.com
Backpatch-through: 13

src/backend/catalog/namespace.c

@@ -2753,6 +2753,9 @@ StatisticsObjIsVisibleExt(Oid stxid, bool *is_missing)
 		{
 			Oid			namespaceId = lfirst_oid(l);
 
+			if (namespaceId == myTempNamespace)
+				continue;		/* do not look in temp namespace */
+
 			if (namespaceId == stxnamespace)
 			{
 				/* Found it first in path */