Small tweaks to smoke tests of planetscale driver in query-engines. #10398

Job	Run time
Test vitess_5_7 (graphql) on Linux	1m 38s
Test vitess_5_7 (json) on Linux	1m 37s
Test vitess_8_0 (graphql) on Linux	2m 10s
Test vitess_8_0 (json) on Linux	3m 30s
Test postgres15 (graphql) on Linux	12m 7s
Test postgres15 (json) on Linux	13m 18s
Test mssql_2022 (graphql) on Linux	8m 14s
Test mssql_2022 (json) on Linux	9m 2s
Test mongodb_4_2 (graphql) on Linux	4m 33s
Test mongodb_4_2 (json) on Linux	3m 54s
Test cockroach_22_2 (graphql) on Linux	24m 34s
Test cockroach_22_2 (json) on Linux	23m 22s
Test cockroach_22_1_0 (graphql) on Linux	19m 13s
Test cockroach_22_1_0 (json) on Linux	21m 28s
	2h 28m 40s

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