fix: Volatile datasource ordering in dashboard export (#19595)

Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>

Author: pnadolny13

superset/models/dashboard.py

@@ -365,8 +365,11 @@ def export_dashboards(  # pylint: disable=too-many-locals
             copied_dashboard.alter_params(remote_id=dashboard_id)
             copied_dashboards.append(copied_dashboard)
 
+        datasource_id_list = list(datasource_ids)
+        datasource_id_list.sort()
+
         eager_datasources = []
-        for datasource_id, _ in datasource_ids:
+        for datasource_id, _ in datasource_id_list:
             eager_datasource = SqlaTable.get_eager_sqlatable_datasource(datasource_id)
             copied_datasource = eager_datasource.copy()
             copied_datasource.alter_params(