Migrate EE Group QA selectors to testid

What does this MR do and why?

As per gitlab-org/quality/quality-engineering/team-tasks#1822 (closed) , we are migrating test attributes from data-qa-selector to standardise on data-testid.

This MR does so for EE Group QA Selectors, as part of the larger effort.

How to set up and validate locally

Run an affected spec eg.

CHROME_HEADLESS=false bundle exec bin/qa Test::Instance::All http://gdk.test:3000/ ./qa/specs/features/ee/browser_ui/10_govern/group/group_saml_enforced_sso_git_access_spec.rb

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.