Ensure correct group for DA chart

What does this MR do and why?

This MR ensures that the group data being used for the chart is the primary selected group.

This bug occurs when there are sub-groups which are returned from graphql before the primary group.

There is no way to current sort / filter this on the backend so we have to do it on the FE.

We need to open a followup issue to be able to filter for ONLY the correct group.

Screenshots or screen recordings

n/a

How to set up and validate locally

• Browse to the DevOps Adoption feature
  • http://localhost:3001/groups/gitlab-org/-/analytics/devops_adoption
• Inspect the chart

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related issue

#337561 (closed)