DRAFT: Minor refactor ci/cd analytics charts

What does this MR do and why?

Minor refactor ci/cd analytics charts

Makes the ci/cd analytics chart components have a consistent structure.

This change is in prepartion for some work to de-duplicate the code.

Screenshots or screen recordings

No visual changes

How to set up and validate locally

# Run the rspec feature specs
$ bin/rspec ./ee/spec/features/groups/analytics/ci_cd_analytics_spec.rb

# Run the jest tests
$ yarn jest dora/components pipelines/charts

MR acceptance checklist

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