Upgrade smoke tests cluster to i3.4xlarge for faster reads

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: caseydm

jobs/snapshot_full.yaml

@@ -326,7 +326,7 @@ resources:
               availability: SPOT_WITH_FALLBACK
               zone_id: auto
               spot_bid_price_percent: 100
-            node_type_id: i3.xlarge
+            node_type_id: i3.4xlarge
             enable_elastic_disk: false
             data_security_mode: SINGLE_USER
             runtime_engine: STANDARD