[sqllab] Fix, #7928 query async not working (#7930)
[sqllab] Fix, #7928 query async not working (#7930)

* [sqllab] Fix, #7928 query async not working

* [sqllab] Fix, allow_ctas and allow_multi_schema_metadata_fetch missing

* [sqllab] Fix, removed column selection on database selector

* [sqllab] Fix, removed config

apache/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,apache/incubator-superset,airbnb/superset,mistercrunch/panoramix,airbnb/superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,airbnb/superset,airbnb/caravel,airbnb/superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,apache/incubator-superset,apache/incubator-superset,apache/incubator-superset,airbnb/caravel,airbnb/caravel,mistercrunch/panoramix