Add indicator circle when new unseen menu items are available (#9220)

## Summary

Adds a little indicator circle when new workflow menu items are added
that the user has not seen

## Changes

- **What**: Adds a hidden setting to track menu items flagged as new
that have been seen

## Screenshots (if applicable)

<img width="164" height="120" alt="image"
src="https://github.com/user-attachments/assets/ac36673d-fbf1-42ff-9a9e-1371eb96115b"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9220-Add-indicator-circle-when-new-unseen-menu-items-are-available-3126d73d3650819cb8cde854d6b6510b)
by [Unito](https://www.unito.io)

src/components/breadcrumb/SubgraphBreadcrumb.vue

@@ -1,7 +1,7 @@
 <template>
   <div
     data-testid="subgraph-breadcrumb"
-    class="subgraph-breadcrumb flex w-auto drop-shadow-(--interface-panel-drop-shadow) items-center"
+    class="subgraph-breadcrumb flex w-auto drop-shadow-(--interface-panel-drop-shadow) items-center -mt-4 pt-4"
     :class="{
       'subgraph-breadcrumb-collapse': collapseTabs,
       'subgraph-breadcrumb-overflow': overflowingTabs