CSV/JSON/XLSX downloads should not be subject to default constraints

src/metabase/api/card.clj

src/metabase/api/common.clj

src/metabase/api/dataset.clj

src/metabase/api/pulse.clj

src/metabase/api/tiles.clj

src/metabase/pulse.clj

src/metabase/query_processor/middleware/constraints.clj

src/metabase/server.clj

test/metabase/api/card_test.clj

test/metabase/api/dataset_test.clj

test/metabase/api/pulse_test.clj

test/metabase/api/tiles_test.clj

test/metabase/pulse_test.clj

.../metabase/query_processor/middleware/constraints_test.clj

test/metabase/task/sync_databases_test.clj