Add UI prompting users to add more labels when slow queries are detected

[gtk-grafana]

Sometimes logQL queries can be slow, sometimes due to the amount of the data that's being requested, sometimes because the query is not optimized.

Can we add a toast or other UI element that prompts users to add more labels when a slow query (> 10s) is detected?

[gtk-grafana]

We discussed this and due to the limitations of the API on the observables we will bump this from the short-term priorities and come back to it