fix(#13734): Properly escape special characters in CSV output (#13735)

* fix: Escape csv content during downloads

* Reuse CsvResponse object

* Use correct mimetype for csv responses

* Ensure that headers are also escaped

* Update escaping logic

superset/charts/api.py

@@ -484,12 +484,7 @@ class ChartRestApi(BaseSupersetModelRestApi):
         if result_format == ChartDataResultFormat.CSV:
             # return the first result
             data = result["queries"][0]["data"]
-            return CsvResponse(
-                data,
-                status=200,
-                headers=generate_download_headers("csv"),
-                mimetype="application/csv",
-            )
+            return CsvResponse(data, headers=generate_download_headers("csv"))
 
         if result_format == ChartDataResultFormat.JSON:
             response_data = simplejson.dumps(