test(go/adbc/driver/snowflake): fix flaky integration tests #264

Job	Run time
check (ubuntu, adbcflightsql) / r-check	3m 52s
check (ubuntu, adbcdrivermanager) / r-check	1m 38s
check (ubuntu, adbcpostgresql) / r-check	3m 46s
check (ubuntu, adbcsnowflake) / r-check	2m 51s
check (ubuntu, adbcsqlite) / r-check	1m 35s
	13m 42s

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