[Bug]: Missing custom nodes status bar - incorrect total

### Frontend Version

1.17.11 / Desktop 0.4.42

### Expected Behavior

The (very cool) task status bar is also an asynchronous parallelising monster.

### Actual Behavior

Gets confused about how many things it's doing.


### Steps to Reproduce

1. Fresh install Desktop app, latest
2. Load AP workflow
3. Click missing nodes button
4. Click `Install` for all 9 node packs, ~750ms gap between each
5. Task list shows current task > total tasks

### Debug Logs

```powershell
Can probably find in logs dir. Ping if needed.
```

### Browser Logs

Cleared before retrieved.

### Setting JSON

Default Desktop CPU install.

### What browsers do you use to access the UI ?

Other

### Other Information

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-3712-Bug-Missing-custom-nodes-status-bar-incorrect-total-1e66d73d36508190a401dd6124d35c33) by [Unito](https://www.unito.io)