add option to pass specific datasources (#1150)

* add option to pass specific datasources
* mypy no-implicit-optional

Author: jacalata

tableauserverclient/server/endpoint/workbooks_endpoint.py

@@ -117,12 +117,13 @@ def create_extract(
 
     # delete all the extracts on 1 workbook
     @api(version="3.3")
-    def delete_extract(self, workbook_item: WorkbookItem, includeAll: bool = True) -> None:
+    def delete_extract(self, workbook_item: WorkbookItem, includeAll: bool = True, datasources=None) -> JobItem:
         id_ = getattr(workbook_item, "id", workbook_item)
         url = "{0}/{1}/deleteExtract".format(self.baseurl, id_)
-        datasource_req = RequestFactory.Workbook.embedded_extract_req(includeAll, None)
+        datasource_req = RequestFactory.Workbook.embedded_extract_req(includeAll, datasources)
         server_response = self.post_request(url, datasource_req)
         new_job = JobItem.from_response(server_response.content, self.parent_srv.namespace)[0]
+        return new_job
 
     # Delete 1 workbook by id
     @api(version="2.0")