Add StageScatterChart component for Value Stream Analytics

What does this MR do and why?

As the first MR to address #367661 (closed), it adds a StageScatterChart component that will eventually replace the StageChart component currently used for "Stage time" in Value Stream Analytics.

References

Screenshots or screen recordings

Screenshot 2025-04-30 at 3.37.33 PM.png

How to set up and validate locally

  1. yarn storybook:start
  2. When the GitLab Storybook opens in your browser, navigate to EE > analytics > cycle_analytics > components > stage_scatter_chart

MR acceptance checklist

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Related to #367661 (closed)

Edited by Rudy Crespo

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