Use two separate bars for new and fixed regressions

[marco-c]

This also allows teams to see if they're increasing the number of carryover regressions over time, or decreasing it.

[marco-c]

This is not currently feasible because of apexcharts/apexcharts.js#196, unless we redesign the chart.

[marco-c]

This is now feasible since apexcharts/apexcharts.js#196 was fixed.

[theoniko]

Hello @marco-c /@suhaibmujahid,
Could you please add a bit more context?
Is the graph you refer to the following?
How the new one should look like blue,green and brown in separate bars?

Relevant function seems renderRegressionsChart in common.js.