Add zero months bin to milestone scores plot

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 29.96%. Comparing base (3b884a0) to head (5b45d94). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...src/lib/components/DataDisplay/PlotScoreAge.svelte	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #182 +/- ## ======================================= Coverage 29.96% 29.96% ======================================= Files 101 101 Lines 3267 3267 Branches 89 89 ======================================= Hits 979 979 Misses 2214 2214 Partials 74 74 ```

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