fix line chart hover
Created by: unclejustin
re-sorts series data to put hovered line last so that the line renders on top.
Closes https://github.com/sourcegraph/sourcegraph/issues/31658
Note ❗
This PR will not actually take effect until https://github.com/sourcegraph/sourcegraph/pull/33799 is merged since it only updates the new line chart component
Test plan
Open Smart Insights View Grid Example in storybook. When hovering over a chart with many lines, the hovered line should always render on top.
App preview:
Check out the client app preview documentation to learn more.