Provider list not updated upon add or delete

Adding and deleting a Provider works. However, the UI does not display these changes in the Provider list. The Provider list should be updated as instances are added/removed.

Steps to Reproduce

1. Log in
2. Create a new workspace.
3. Click LLM Providers
4. Add an LLM provider.
5. The new LLM provider will not display. Refresh the page.
6. Delete the LLM provider.
7. The deleted LLM provider will still be displayed.

A successful addition message where the Provider wasn't added to the list.

The refreshed page showing the new Provider instance

A successful delete message where the Provider wasn't deleted from the list.