Test fix; remove unused new driver methods [ci skip]

src/metabase/driver.clj

src/metabase/driver/generic_sql.clj

src/metabase/driver/generic_sql/query_processor.clj

src/metabase/driver/snowflake.clj

src/metabase/query_processor/middleware/annotate.clj

test/metabase/query_processor_test/filter_test.clj

test/metabase/query_processor_test/nested_queries_test.clj