fix image width to 1000px for email (#14527)
fix image width to 1000px for email (#14527)


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