fix(embedded): CSV download for chart (#20261)

* move postForm to superset client

* lint

* fix lint

* fix type

* update tests

* add tests

* add test for form submit

* add test for request form

* lint

* fix test

* fix tests

* more tests

* more tests

* test

* lint

* more test for postForm

* lint

* Update superset-frontend/packages/superset-ui-core/test/connection/SupersetClientClass.test.ts

Co-authored-by: David Aaron Suddjian <1858430+suddjian@users.noreply.github.com>

* update tests

* remove useless test

* make test cover happy

* make test cover happy

* make test cover happy

* make codecov happy

* make codecov happy

Co-authored-by: David Aaron Suddjian <1858430+suddjian@users.noreply.github.com>

superset-frontend/src/components/Chart/chartAction.js

@@ -27,7 +27,6 @@ import {
   getExploreUrl,
   getLegacyEndpointType,
   buildV1ChartDataPayload,
-  postForm,
   shouldUseLegacyApi,
   getChartDataUri,
 } from 'src/explore/exploreUtils';
@@ -40,6 +39,7 @@ import { addDangerToast } from 'src/components/MessageToasts/actions';
 import { logEvent } from 'src/logger/actions';
 import { Logger, LOG_ACTIONS_LOAD_CHART } from 'src/logger/LogUtils';
 import { getClientErrorObject } from 'src/utils/getClientErrorObject';
+import { safeStringify } from 'src/utils/safeStringify';
 import { allowCrossDomain as domainShardingEnabled } from 'src/utils/hostNamesConfig';
 import { updateDataMask } from 'src/dataMask/actions';
 import { waitForAsyncData } from 'src/middleware/asyncEvent';
@@ -563,7 +563,9 @@ export function redirectSQLLab(formData) {
           datasourceKey: formData.datasource,
           sql: json.result[0].query,
         };
-        postForm(redirectUrl, payload);
+        SupersetClient.postForm(redirectUrl, {
+          form_data: safeStringify(payload),
+        });
       })
       .catch(() =>
         dispatch(addDangerToast(t('An error occurred while loading the SQL'))),