Code Insights: Fix unequal series length charts for BE insights
Created by: vovakulikov
Fixes https://github.com/sourcegraph/sourcegraph/issues/23257
This PR adds series initial value (null value) for the points that don't have a real value for the date-time point that other series have. By adding thins null initial value we adding visual gray line background (see screenshot below)
Before | After |
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