Add time remaining to embedding reindex pane (#14279)

* Add function to convert seconds to human readable duration

* Add estimated time remaining to reindexing pane

web/src/types/ws.ts

@@ -67,6 +67,7 @@ export type EmbeddingsReindexProgressType = {
   descriptions: number;
   processed_objects: number;
   total_objects: number;
+  time_remaining: number;
 };
 
 export type ToggleableSetting = "ON" | "OFF";