Code Insights: Improve creation UI live preview flow

Created by: vovakulikov

Background

We shouldn't block live previews from fetching data if the non-essential fields aren't filled out (like colours or names). Also, changing colour settings shouldn't trigger data re-fetching and should just "hot-reload" the live chart without the loading step.

Original comment from @AlicjaSuska

general flow-related thought: we load the live preview only after user fills out both query and the name. Maybe we could load it after entering only the search query and use a temporary name 'data series 1' until user enters their own name? Not necessary for this issue, but I think it would make the flow smoother.