Automate Instance Snapshot Creation

### Description

Currently, creating a snapshot of a Node-RED instance is a manual task, which can be time-consuming and sometimes might get missed. Users might also forget to delete older snapshots, leading to excess use of storage space. To enhance the user experience and ensure data safety, it would be beneficial to introduce automation functionalities for snapshot creation and retention. These features would not only automate the backup process. The new functionalities would include scheduled automatic snapshots, snapshots for the last 'n' deployments, and a default retention policy for managing stored snapshots. With these new functionalities, users can easily manage their snapshots, reduce manual intervention, and maintain a healthy balance of storage space.
```[tasklist]
### User Stories
- [ ] https://github.com/flowforge/flowforge/issues/2422
- [ ] https://github.com/flowforge/flowforge/issues/2423
- [ ] https://github.com/flowforge/flowforge/issues/2424
```