Change feature flag group

What does this MR do and why?

This MR changes the group property of the graphql_code_quality_full_report feature flag from grouptesting to groupstatic analysis

Category handoff issue: gitlab-com/Product#2563 (closed)

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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 to #340525 (closed)