Move `with-empty-h2-app-db` macro to metabase.test (#28773)

...ckend/test/metabase_enterprise/serialization/cmd_test.clj

...kend/test/metabase_enterprise/serialization/test_util.clj

...etabase_enterprise/serialization/v2/backfill_ids_test.clj

...est/metabase_enterprise/serialization/v2/extract_test.clj

...d/test/metabase_enterprise/serialization/v2/load_test.clj

...etabase_enterprise/serialization/v2/storage/yaml_test.clj

...d/test/metabase_enterprise/serialization/v2/util_test.clj

...tabase/driver/bigquery_cloud_sdk/query_processor_test.clj

...loud-sdk/test/metabase/driver/bigquery_cloud_sdk_test.clj

modules/drivers/oracle/test/metabase/driver/oracle_test.clj

...s/drivers/redshift/test/metabase/driver/redshift_test.clj

test/metabase/db/schema_migrations_test.clj

test/metabase/db/schema_migrations_test/impl.clj

test/metabase/db/test_util.clj

test/metabase/sync/util_test.clj

test/metabase/test.clj

test/metabase/test/data.clj

test/metabase/test/data/one_off_dbs.clj

test/metabase/test/util.clj

test/metabase/test/util/random.clj