chore: Support for updated_within in ConverationFinder (#8947)

- `updated_within' accepts value in seconds and returns all conversations updated in the given period with out pagination. This API will assist in our refetch logic on socket disconnect

ref: #8888

app/finders/conversation_finder.rb

@@ -169,6 +169,12 @@ class ConversationFinder
     )
 
     sort_by, sort_order = SORT_OPTIONS[params[:sort_by]] || SORT_OPTIONS['last_activity_at_desc']
-    @conversations.send(sort_by, sort_order).page(current_page).per(ENV.fetch('CONVERSATION_RESULTS_PER_PAGE', '25').to_i)
+    @conversations = @conversations.send(sort_by, sort_order)
+
+    if params[:updated_within].present?
+      @conversations.where('conversations.updated_at > ?', Time.zone.now - params[:updated_within].to_i.seconds)
+    else
+      @conversations.page(current_page).per(ENV.fetch('CONVERSATION_RESULTS_PER_PAGE', '25').to_i)
+    end
   end
 end