Apply filters to StageScatterChart in Value Stream Analytics

What does this MR do and why?

As the third MR to address #367661 (closed), it applies selected filters from the filter bar in Value Stream Analytics to the newly created "Stage time" scatter chart.

It also depends on !190239 (merged), which adds the StageScatterChart component to VSA behind the vsa_stage_time_scatter_chart feature flag.

References

• #367661 (closed)

Screenshots or screen recordings

Before	After
Screen Recording 2025-05-07 at 3.17.03 PM.mov	Screen Recording 2025-05-07 at 3.15.32 PM.mov

How to set up and validate locally

1. Please make sure that you're on the GitLab Ultimate plan.
2. Feature.enable(:vsa_stage_time_scatter_chart)
3. Visit any group/project that has VSA data or follow these steps:
   1. run FILTER=customizable_cycle_analytics SEED_CUSTOMIZABLE_CYCLE_ANALYTICS=1 bundle exec rake db:seed_fu
   2. Visit the group/project value stream. The URL is present in the output of the command above.
4. Select any stage in the path navigation
5. Select any attributes in the filter bar
6. Verify that the data in the scatter chart has been filtered

MR acceptance checklist

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Related to #367661 (closed)