test(go/adbc/driver/snowflake): fix flaky integration tests #266

Job	Run time
check (ubuntu, adbcdrivermanager) / r-check	1m 59s
check (ubuntu, adbcflightsql) / r-check	3m 23s
check (ubuntu, adbcpostgresql) / r-check	2m 6s
check (ubuntu, adbcsnowflake) / r-check	2m 23s
check (ubuntu, adbcsqlite) / r-check	2m 10s
	12m 1s

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