fix: set dataLabels.padding to 0 to avoid labels being cut off in pie charts

[HendrikThePendric]

Implements DHIS2-16505

Relates to a yet-to-be-created PR in DV

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Key features

1. Prevent labels being cut off in pie charts

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Description

Setting the padding to zero fixes the reported issue.

As far as I am aware, there is no way of knowing exactly when the label is going to get cut off. As such this is an all-or-nothing type of solution: we set padding to 0 for all pie-charts, or we keep things the way they are.

I have checked a few other pie-charts and vieports sizes and do not see any visual degaradations/changes due to this change, so I suggest we make this change.

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Reproduction path

1. Open Pie Chart "Immunization: Fully Immunized by Facility Type" in the data-visualizer-app
2. Reduce the viewport height to ~375px
3. Observe that the bottom label is partially cut off

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Test the fix

1. Download the attached custom DV bundle (version 999.9.9-2024-06-12T15-12-27) with this fix included
2. Install it to a DHIS2 Core instance
3. Follow the reproduction path above and observe that the bottom label is now fully visible

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Screenshots

Before

After

[martinkrulltott]

Code approved. Needs thorough testing in both DV and Dashboards though before merging