Revert "Merge branch 'jennli-group-svc-spec' into 'master'"

Purpose of revert

Revert Unquarantine group_service_spec with fix (!128054 - merged) because the 2 unquarantined tests are still failing.

incidents:

• gitlab-org/quality/engineering-productivity/master-broken-incidents#3189 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3181 (closed)

Checklist

• Create an issue to reinstate the merge request and assign it to the author of the reverted merge request.
• If the revert is to resolve a broken 'master' incident, please read through the Responsibilities of the Broken master resolution DRI.
• If the revert involves a database migration, please read through Deleting existing migrations.
• Add the appropriate labels before the MR is created. We can skip CI/CD jobs only if the labels are added before the CI/CD pipeline is created.

Milestone info

• I am reverting something in the current milestone. No changelog is needed, and I've added a ~"regression:*" label.
• I am reverting something in a different milestone. A changelog is needed, and I've removed the ~"regression:*" label.

Related issues and merge requests