fix(thumbnails): ensure consistent cache_key (#33109)

(cherry picked from commit 347c174099)

superset/dashboards/api.py

@@ -1303,6 +1303,7 @@ class DashboardRestApi(BaseSupersetModelRestApi):
                 current_user=current_user,
                 dashboard_id=dashboard.id,
                 force=False,
+                cache_key=cache_key,
             )
             return self.response(
                 202,

superset/tasks/thumbnails.py

@@ -78,6 +78,7 @@ def cache_dashboard_thumbnail(
     force: bool,
     thumb_size: Optional[WindowSize] = None,
     window_size: Optional[WindowSize] = None,
+    cache_key: str | None = None,
 ) -> None:
     # pylint: disable=import-outside-toplevel
     from superset.models.dashboard import Dashboard
@@ -103,6 +104,7 @@ def cache_dashboard_thumbnail(
             window_size=window_size,
             thumb_size=thumb_size,
             force=force,
+            cache_key=cache_key,
         )