DevOps Adoption - Remove data-testid constants

What does this MR do and why?

Removes the exported test ids in order to make it easier to strip test-ids from production at a later stage.

Screenshots or screen recordings

n/a

How to set up and validate locally

yarn jest ee/spec/frontend/analytics/devops_report/devops_adoption/

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 #339452 (closed)