Fix KV benchmark lookups to order in subqueries before SELECT VALUE

This avoids Surreal parse errors and allows arbitrary context key/value benchmarks to run successfully.

tests/ZB.MOM.WW.CDBBC.E2E.Benchmark.Tests/SurrealLogStorageBenchmarks.cs

@@ -143,7 +143,8 @@ public class SurrealLogStorageBenchmarks
         await ExecuteQueryAsync(
             $"""
              LET $logIds = (
-               SELECT VALUE logId FROM {LogKvTable}
+               SELECT VALUE logId FROM (
+                 SELECT logId, timestamp FROM {LogKvTable}
                  WHERE loggerName = $loggerName
                    AND key = $contextKey
                    AND valueStr = $contextValueStr
@@ -151,6 +152,7 @@ public class SurrealLogStorageBenchmarks
                    AND timestamp <= $toTs
                  ORDER BY timestamp DESC
                  LIMIT 200
+               )
              );
              SELECT * FROM {LogTable}
              WHERE id INSIDE $logIds
@@ -173,7 +175,8 @@ public class SurrealLogStorageBenchmarks
         await ExecuteQueryAsync(
             $"""
              LET $logIds = (
-               SELECT VALUE logId FROM {LogKvTable}
+               SELECT VALUE logId FROM (
+                 SELECT logId, timestamp FROM {LogKvTable}
                  WHERE loggerName = $loggerName
                    AND key = $contextKey
                    AND valueNum = $contextValueNum
@@ -181,6 +184,7 @@ public class SurrealLogStorageBenchmarks
                    AND timestamp <= $toTs
                  ORDER BY timestamp DESC
                  LIMIT 200
+               )
              );
              SELECT * FROM {LogTable}
              WHERE id INSIDE $logIds